As mentioned in my previous entries, I have just recovered from Hhypothyroidism that lasted for over 600 days.

600 days is very specific. I would probably just say "almost 2 years." I don't want to minimize what you went through at all, but usually specific numbers of days are used for acute conditions or situations of extreme suffering.

I thought Iit was the right way to be a good person.

And indeed I had some achievements inwith this waymindset.

But I had ignored my body for a too long time, until COVID-19 hit me with Hhypothyroidism.

Instead of regretting and complaining, think about what I can do right now ¶
In the beginning, I regretted a lothad many regrets.

Just a weird quirk of "regret", we don't typically use it as a verb by itself without an object. You regret something, or you have regrets. You could also say "I regretted many things."

I shouldn't have worked overnight when I hadn't fully recovered from COVID-19.

This is fine. Another very common expression is "to pull an all-nighter."

I should go to the hospital the first time I feelt something wrong with my body.

My parents don't know anything about my disease of thyroidthyroid disease, not even today.

As mentioned in my previous entries, I have just recovered from Hhypothyroidism that lasted for over 600 days.

Medical conditions are typically lowercase, but there are exceptions (e.g. Hepatitis C, HIV).

When I got home yesterday with themy latest health examination report, I reviewed those days and the whole process, and then I summarized it into some lessons for myself in the future.

1.

Take my body seriously ¶
I aimed to excel academically in school and to remain driven in my professional career.

I thought Iit was the right way to be a good person.

And indeed I had some achievements in this waywith tthis line of thinking.

But I had ignored my body for a too long a time until COVID-19 hit me with Hhypothyroidism.

Now I have a checklist that includes diet, exercise, sleeping timeenough sleep, etc.

Instead of regretting and complaining, think about what I can do right now ¶
In the beginning, I regretted a lot.

I should gohave gone to the hospital the first time I felt something wrong with my body.

etc., etc.

etc.

I found that regret and complaints were detrimental things thatand only worsened my feelings ands well as the situation.

My parents don't know anything about my disease of thyroidthyroid disease, not even today.

I had done some research online and found that I would suffer many low and depressed feelings because of the disease.

Usually, I couldan deal with my parents well, but I didn't think I could handle ithem well when I was in a bad mood.

I'm so appreciative that they cheered me up every time I was down, and gave me many great pieces of advice when I needed hem.

Be considerate of others because I don't know how others are suffering ¶
When you see a person with a weakened thyroid, you would probably assume that he is a healthy person, who is at best a little fatigued.

That's all for today.

From The Days When I Was Suffering from HypothyroidismROM THE DAYS WHEN I WAS SUFFERING FROM HYPOTHYROIDISM

You can use all-caps. I personally don't like "the first letter is in the capital letter" method because it's stressful to guess which one I should to put in the capital letter 🥲

As mentioned in my previous entries, I have just recovered from Hypothyroidism that lasted for over 600 days.

Take my body seriously ¶
Igood care of my health. My aimed is to excel academically in school and to remain driven ifocused on my professional career.

I thought Iit was the right way to be a good person.

'It' can only be in the capital letter if it's at the beginning of a sentence or after a full stop.
I'm, I've, I'll and I, however can be the capital letter wherever they are in the sentence.

And iIndeed, I had some achievements in this way.

It's best if you don't start a sentence with a conjunction. Examples of conjunction are and, because, but, or.

But I had ignoreddidn't take good care of my body for a too long time until COVID-19 hit me with Hypothyroidism.

Instead of regretting and complaining, it's better to think about what I can do right now .¶
In the beginning, I regretted a lot.

I should go to the hospital the first time I felt something wrong with my body.

Why did my parents bother me with smallinsignificant things when I was sick?

etcand so on.

You can use this too.

No need for 2 etc.

I found that regret and complaints were detrimental things that only worsened my feelings and the situation.

My parents don't know anything about my disease of thyroid, not even today.

The reason I chose not to tell them was that my parents tend to blame me for everything bad that happens to me.

I had done some research online and found out that I would suffer manyfrom low and depressed feelings because of the disease.

Usually, I could deal with my parents well, but I didn't think I could handle it well when I was in a bad mood.

I'm so appreciative that they cheered me up every time I was down, and gave me many great pieces of advice when I needed them.

Be considerate of others because I don't know how others are suffering .¶
When you see a person with a weakened thyroid, you would probably assume that he is a healthy person, who is at bemost a little fatigued.

That's all for today.