i had suspected celiac disease as a kid and was troubled with stomach issues right up until i fixed it with diet over the last 4 to 5 years, my advice for any symptoms like this, go to the doc let them check its nothing serious and if they tell you its IBS (which they love telling people) and try to medicate you, i would take a radical look at the diet.
it was the single best thing i did for my general health. Cut out processed carbs, no more pastas or white bread, copious amounts of veg, white meat and fish, wholegrains and fibre rich foods. Limit your caffeine intake and increase your water intake.
when you are in total control of your diet you will notice certain foods trigger the onset of the troubles. For me if i even eat the smallest bowl of pasta because i love it and cant say no when offered the trade off is an evening of a stomach 3 times the size it usually is, im a slim guy and it looks like i have an alien in my stomach when it happens.
like i say be sure it is nothing serious first and then really focus on the stuff going into your body mate. If you drink beer that has to go aswell, it is a trigger for me so had to switch to other drinks.
hopefully you get sorted though mate, having been through it all it is hard to explain to people how much stomach problems can make daily life an absolute nightmare
