hey
u should go to your doc like zepora said for peace of mind sake unless you have been diagnosed with ibs already?.
some people put on weight with ibs all depends on your metabolism and what kind of foods u are eating.
it might be good to have your thyroid levels checked as well .there are lots of things that can minic ibs
post back on how u are getting on
Have you seen a Doctor regarding these symptoms? I believe you should have a colonoscopy and a barium swallow to see if it is IBS or/and Acid Reflux. Don't leave this for too much longer, as it sounds like it could be something more serious than you might think. The fact that you have eaten very little and still haven't lost weight and the pressure and discomfort around your belly are all symptoms. Please talk to your Doctor, at least, and hopefully you'll get a referral to see a GI Specialist soon. You are still so very young to have these symptoms. Are you under a lot of stress or severe trauma in your life right now or recently? All of these things can contribute to IBS.
Hope you find help soon and my prayers are with you
zepora