I know this stuff can cause your internals to expand so maybe it could be that as well. I'm feeling sharp pains from right underneath my chest down to my upper stomach area above my belly button. But most of the pain is definitely right in the middle of me.
honestly it could be internal bleeding, caused by too much acid in the stomach, ie an ulcer dude. i had the same issue when i was young and its why i stopped drinking any alcohol when i was 23. its just not worth it. it may sound funny, but try cigs and some coffee, you will find it much more enjoyable especially if you have a GF or looking for one. most girls dig guys who take care of themselves, but dont drink. you dont want party girls in your life if you are a bodybuilder bro........take it from me, been there, done that.
my best advice for you is just start taking care of yourself if you dont have insurance. start taking actacids and quit thinking you cant get hurt from OTC stuff, more times than not they are worse than scripts. if you take any aspirin, stop taking it, it thins the blood, and not good for ulcers man.
PM if you need any additional help dude. you sound like a young guy and Im here to help. ive going through majoy health issues from being a HARDCORE bodybuilder when I was younger, and its not worth the added risk, take life as it comes, dont rush it ya kno?