Hi-I've had many years of chronic constipation. For the past 10 or more years, after eating there is lower abdominal cramping,pressure in lower abdomen and rectal area, and frequently either urgent stools or diarrhea. This can happen from as soon as minutes after eating up to an hour later. Originally, I thought maybe IBS-symptoms improved for about 2 yrs. After a colonoscopy,but are back.