I am a 23 year old female who has been having nausea, and lower abdominal pain for 2 years now. I weigh 100 pounds,and cannot gain any weight. Every morning I wake up with severe nausea to the point I gag. I also have lower stomach pain on (both sides), and it spreads to my back. I develop alot of gas, with pressure, and bloating on a daily basis. Sometimes I have pain around my rectum area. I do not have hemmoroids, and it is not after a bowel movement either. I do have regular BM's, which sometimes are extremely painful. I have had an H Proli test and it was negative. I am not lactose intolarant, and I do not have IBS. Can someone PLEASE give me any advise, or give me an opinion of what they think it could be. I really do not know what step I should take next. I really am so tierd of being sick every day.