Yesterday I slept for 5 hours.

Recently is even worst, I had been slepteping less every night, after midday, I would go back to sleep and that would be a long time, of course then I couldn't sleep at night.

If I take some caffeine, yeah it's good, I wouldn't need to sleep that night XD ¶
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I'm tired of getting trouble ofstruggling to sleep.

I might need to get ato to doctor if it doesn't better.

In my context, that's mean I got into trouble at a long time, then.

Recently ist has gotten even worste, as I hadve been slepteping less every night, a. After midday, I would go back to sleep and that would befor a long time, and then of course then I couldI can't sleep at night.

Changed to sound more natural.
"Worst" is only used for the MOST bad.

If I take some caffeine, yeah it's good, I wouldn't need to sleep that night XD ¶
and I can get through the night without sleeping XD¶
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I'm tired of getthaving trouble ofwith my sleep.

Not 100% sure what you're trying to say here but I've corrected it to make sense.

My head is dizzy,. I feel like a .... press me down (what's the better word or phrase or sentence fit into this context?)cushion is pressing me down.

I might need to getsee at doctor if it doesn't get better.

Normally, one "sees" the doctor

I don't know when to use "had been", what's the difference to "have been"?

In my context, that's mean I got trouble at a long time, then

Yesterday I slept for 5 hours.

Recently is evenmy sleep schedule has just been the worst,. I hadve been slepteping less and less every night, a. After midday, I would go back to sleep and that would befor a long time, but of course then I cwouldn't be able to sleep at night.

(1) It's generally not good to string lots of phrases together with commas. You should either break them up by starting new sentences, or you could join some together using connectives. My suggestion is just one possible way of doing this.

(2) I'm not quite sure what you were trying to say by "recently is even worst".
If you were trying to compare your sleep from recent days to your sleep "yesterday" from the previous sentence, then you should say something like "recently it has been even worse".
If you were just trying to say that your sleep schedule has generally been bad recently, then it's possible that you meant something like "recently it has just been the worst". This is a kind of casual/informal phrase because of the exaggeration used.

If I take some caffeine, then yeah it's good, because I wouldn't need to sleep that night XD ¶
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I'm tired of getthaving trouble getting tof sleep.

My head isI feel dizzy,. It feels like a .... press me down (what's the better word or phrase or sentence fit into this context?)there's a weight on my head.

(1) "I feel dizzy" sounds more natural than "my head is dizzy". Some other ways to say this are:

My head feels like it's spinning.
I feel light-headed.

(2) For the second phrase, I don't think there's a clear best choice. Here are some alternatives I thought of:

It feels like my head is being squeezed/crushed.
My head is throbbing.
My head feels heavy.

I might need to geto to at doctor if it doesn't get better.

I don't know when to use "had been", what's the. How is it differencet to "have been"?

I think that "have been" implies that something is continuing into the present, whereas "had been" refers to something that has stopped.
For example:

I have been playing a lot of football recently (and I still am now)
He has been listening to a lot of music these days (and he still is now)
I had wanted to go to the cinema, but all the tickets were sold out (so now I don't want to go to the cinema)
We had been hoping to travel abroad, until we realised how expensive the flights are (so now we don't want to travel abroad)

So in your context, since your sleep problems are still ongoing, you should be using "have been".

I have been sleeping badly these days (and I still am now)
I had been sleeping badly, until... (it feels like something changed and now you sleep well)

Also a lot of the time you'll see "I've" instead of "I have" and "I'd" instead of "I had". It's not necessary to do this but it's very common in speech or informal writing.

Recently, ist's been even worste, I had been slepteping less every night, a. After midday, I would go back to sleep and that would be for a long time, of course then I couldn't sleep at night.

Using the tense 'I had been sleeping less every night' doesn't quite fit with 'recently it's been even worse'. 'Recently' goes more with 'I've been ...' not 'I had been ...'.

If I takeook some caffeine, yeah it' was good, I wouldn't need to sleep that night XD ¶
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I'm tired of getting trouble ofbad sleep.

- 'I wouldn't need to sleep' implies past tense so need to use 'took' instead of 'take'. If you meant present tense you could say 'If I take some caffeine, yeah it's good, I don't need to sleep at night XD'
- Could say 'Tired of having troubled sleep' but 'trouble of sleep' isn't grammatically correct

My head is dizzy, feels like a .... press me down (what's the better word or phrase or sentence fit into this context?)gravity has doubled and is dragging me down.

- You can either say 'I feel like ...' or you can say 'feels like ...'. The latter is far more familiar and is short for 'it feels like' but when speaking people omit the 'it'. You wouldn't really have this in writing but it depends on the style you want, whether you want people to read it as if you the author are talking to them or whether you want them to read it as if you the author are writing to them

I might need to geto to at doctor if it doesn't get better.

- Get a doctor implies you yourself having a personal doctor which is different to just going to a doctor to get a checkup
- Could say 'doesn't improve' but you can't say doesn't better, you need to add 'get' in between

I don't know when to use "had been", what's the difference to "have been"?

There's a distinct difference between the two. Briefly 'had been' refers to something that was true or happening before another point in the past, but is no longer happening no. 'have been' on the other hand means it was like this (in the past) and is still like this in the present

In my context, that's mean I got trouble at a long time, then

I don't know what you're asking here