Stomach issue, need help!

Hello, its pretty strange, sometimes when I eat after 7-8pm I wake up in the next morning with pain in the stomach...when I dont eat everything seems to be fine...maybe something that has to do with acid or I am not sure...I have a big appetite and don't feel any pain while eating or anything..also, after I wake up...once i eat something quick or drink...the pain just goes away ..


I need an advice on how to fix the problem please!

Also, my diet consists of mainly veggies and fish..I don't eat meat...but maybe the fish has mercury...

I also wanted to know, I see many different opinions about distillers, some people say its bad for you some say its good...I don't know which to believe..should I get one?

Thanks a lot!