Diarrhea after a heavy meal?

i have diarrhea after a heavy meal i would like to know if irritable bowel syndrome causes painful pinpricks and diarrhea,then abit of normal stool after a heavy meal.Because if i eat at my normal rate i would have abdominal pain but not as bad as if i ate at a full rate. so i hope ppl out there can help me with discovering what i have..cause i have been to so many doctors and they do not want to diagnose me so pls anyone can identify wat it is.it would be a bonus point for me thanks.

Sounds like you have some food allergies or intolerance's. See your doctor again, and insist on blood tests to rule these out. I have coeliac ( celiac ) disease, and for years i felt bloated, had diarrhea after every meal as well as feeling tired all of the time and depression too. I was diagnosed just under a year ago and feel much better now. So, do go to the doctor and don't leave the surgery until you hear something positive !

too much food or sugar

It is called "Gastric Dumping Syndrome."

Caused usually by:
1. High Fat Meals
2. Meal high in starch
3. Meal rich in dairy
4. Sugary snacks
5. Corn and corn by-products

I'm sorry, I know you want a serious answer, but I was sitting here thinking "Oh, if only that could happen to me!" I have such problems voiding (perennial constipation, for decades) that diarrhea after a heavy meal sounds delightful. If only all bodies could be that regulated. "Hey, you ate too much! I'm just going to get rid of it all and we can get back to normal!"

Good luck finding the solution ... and thank you for letting me see the grass on the other side of the fence.