My stomach doesn’t feel well (right) now. My stomach doesn’t feel well (right) now.

My stomach doesn’t feel well right now. My stomach doesn’t feel well right now.

„Right now“ better shows that you’re not feeling well in this moment, but if you want to say you’ve not been feeling well all morning, you could say „my stomach hasn’t been feeling well today “

My stomach doesn’t feel well nowgood. My stomach doesn’t feel good.

This sounds perfectly natural without the "now" and conveys the same meaning

I went to the print shop, and, next to it is the supermarket, so where I bought some snacks and ate them all. I went to the print shop next to the supermarket where I bought some snacks and ate them all.

Sounds more natural

I went to the print shop, and, next to it is since the supermarket, so is next to it I bought some snacks and ate them all. I went to the print shop, and since the supermarket is next to it I bought some snacks and ate them all.

Rearranging the sentence like this sounds more natural if you want it to be just one sentence. You could also say „…to the print shop. The supermarket is next to it, so I bought some snacks…“

I went to the print shop, and, next to it since there is thea supermarket, so next to it, I bought some snacks and ate them all. I went to the print shop, and since there is a supermarket next to it, I bought some snacks and ate them all.

I went to the print shop, and, n. Next to it i, was the supermarket, so. So, I bought some snacks and ate them all. I went to the print shop. Next to it, was the supermarket. So, I bought some snacks and ate them all.

I shouldn’t have eaten so muchany things before I go to bed!!!! I shouldn’t have eaten so many things before bed!!!!

This is a mistake most English speakers make, but "eaten" is correct here. As for many vs much: "Many" is for describing a number of items and "much" is for describing a quantity. example: "Many things" or "much stuff" (stuff is not a number of things) "Many containers of water" or "much water"

I shouldn’t have eaten so much things before I gowent to bed!!!! I shouldn’t have eaten so much before I went to bed!!!!

I shouldn’t have eaten so muchany things before I going to bed!!!! I shouldn’t have eaten so many things before going to bed!!!!

To expand on the explanation of "many" and "much", you use "many" when you're talking about countable things. If it would make sense to say "one [thing]" then you would use "many", while if it doesn't make sense then you'd use "much".

I shouldn’t have eaten so muchany things before I go towent bed!!!! I shouldn’t have eaten so many things before I went bed!!!!

I’m regretting it. I’m regretting it.

I’m regretting it now. I’m regretting it now.

I’m regretting it. I’m regretting it.

Regret is a transitive verb so you have to give it an object (thing that you regret)

I’m regretting it. I’m regretting it.