Stomach problems?

i have diarrhea, abdominal cramps, bloating, nausea for 1.5 months now. i have a history of ibs. diarrhea stops when i take the anti-diarrheal imodium but comes back when i stop it. there is no weight loss or much loss in energy levels. what should i do? how long will this spell of ibs last? there is no change if i try bland foods, the problem is equally bad irrespective of the kind of food ingested.