I apologize in advance for this being such a long post but need your opinion. For years I've been convinced I have IBS but after talking to a friend who has Celiac Disease I feel that's a strong possibility for me as well. Here's my story:I'm male, 51 years old, and was told about 18 years ago by a physician that I have IBS. In the beginning I went from being normal to being very, very sick with multiple bouts of diarrhea per day that none of the over the counter meds would help -- but was later quickly put into check after taking predisone. All of this seemed to have begun after taking an antibiotic. At first the doctor thought I had ulcerative colitis after she found inflamation during a sigmoidoscopy she performed and I was put on a IBD med that for about a year which really did not do a thing. Then I had a colonoscopy at that time and it was determined I had IBS since the scope indicated no problems. Doctor said to increase my fiber intake such as taking Fibercon -- which I did and after a while things greatly improved. Later I was able to go off the Fibercon and seemed to be over the intestinal problems for the most part. I still had many bouts of urgent diarrhea, bloating, bad gas usually after eating a large meal or foods with spice. Other foods such as peanuts, Coke, eating a lot of candy and/or chocolate, foods with teriakaki sauce on it, and various other foods will kick it off. Well, for whatever reason, for the last 4 weeks I've been dealing with multiple bouts of diarrhea per day. For the first two weeks it was nothing but watery, explosive diarrhea several times per day blowing out yellowish particle material that mostly floats in the water and stinks to high heaven. Then for the past week the diarrhea BMs have become less watery but still explosive with particle material that floats. When I have a BM there is usually a huge amount of gas/air that comes out as well. I have always been a daily gas passer some of them very foul. When the need to have a BM suddenly hits, I have to find a john fast. I do have abdominal pain in various places in the abdomen right now but sometimes that's relieved after passing gas or having a BM, but for the most part the gut pain is present but not to a very high degree. By the way, over the counter meds to not help and neither is the Fibercon.I went to my GP doctor last week and he felt around and ordered a ultra sound of my abdomen which came out normal in terms of my gallbladder and liver. He was concerned it might be appendicitis but I'm pretty sure that's not it but it could be, I guess. After the tests were shown negative he's pretty much blown me off as it being IBS. Anyway, the diarrhea persists and a few days ago, when the need for a BM hit me, I did not make it to the toilet fast enough and literally messed my pants -- fortunately I was at home. Before that time as well as after there have been times where I've come close to not making it in time to the john. My symptoms are mainly:- Explosive, foul-smelling, sometimes watery but always very loose diarrhea that generates a particle-like matter that floats and some of it sinking and a lot of it gets plastered on the walls of the toilet. The color was a yellowish color for the first two weeks now it's the same consistency explained above but it's more of a yellowish-brown color now.- Pain and bloating but the pain is not too noticeable most of the time but is felt when pressure is applied to the abdomen and sometimes noticeable when there is no pressure on the abdomen.- General feeling of bloating but not all the time.- Weight loss -- about 6 pounds in last 3 weeks.- Lately I've had a lot of fatigue and feel zone-out (brain fog) in the afternoons.What do you think? Does this sound like IBS or Celiac Disease? By the way, I am on an antidepressant mostly for anxiety and some depression. I don't usually get bowel problems associated with the anxiety, though. I've been on antidepressants for about 10 years.Thanks for your help.