@drksidr that sounds awful!
Everything but the stomach issues seems to be related to your head getting hurt. But, the first question is why did you faint?
A neurologist is the specialist you need to see.

I have acid reflux too. It makes me cough terribly when lying down to sleep. My doctor suggested that I take some Mylanta liquid just before bed. I do now and it’s been much better.

Good luck to you.