What disease do I actually have? Fed up.

In past 2 month I have been diagnosed with Entiritis , IBS, Indigestion and SRUS(Ulcer finding by sigmoidoscopy) by various doctors but I still dont feel good. I have taken antibiotics prescribed by doctors, Sucralfate suspension syrup, Rebeprazole+Domperidom , Aciloc 150, Sitcom Forte, Digestive enzyme syrup but nothing seems to be working. I am still in a lot of pain especially the right side of lower ribcage hurts with pulsating pain and I have too much gas. I am also having too much burning while passing stool but the medicines suggested by doctors dont seem to be providing much relief apart from that I seem to feel very dehydrated.  Please suggest me what medicines should I take and what could be my potential  disease as I am really fed up.