what is wrong with me

For the past two weeks i have been experiencing severe lower abdominal cramping following by watery diarrhea with undigested food, usually within about 15-30 minutes after eating. What i eat, the symptoms are the same. I have 5 to 10 of these episodes a day.  I try to drink a glass of pedialite each day knowing I am dehydrating.  I do take immodium or levbid, but that only helps for a few hours.  Its getting to the point I can't go out of the house and avoid eating unless i have taken anti-diarrheals.  I have been diagnosed in the past with IBD but the symptoms were never this severe and lasted so long.  Please, anyone have an opinion, thoughts?