i have similar problems. the thing that helped me the most was something called the specific carbohydrate diet, which is quite strict. i was on it for 5 months -- big improvement in digestion. however, i lost too much weight (i'm quite thin) and it was very incovenient for me. if you can commmit yourself to it, i would highly recommend it.
also, water fasting has helped me in the past temporarily. i've done it from one day to about 4 days. the longer the better, but do your research beforehand
Hi, since your diagnosis was fine what was the explanation? It sounds like IBS.