3 years ago my wife had about 1 foot of bowel removed. she was having trouble going and would have a prolapse on occasion. she has got along pretty good until a few months ago she started having constipation again. she sometimes feels like she has to go but only a little pebble might drop.she s afraid to push to hard for fear of a prolapse.she is going to get a colonoscopy here soon.she s concerned this could be the same or worse than the last surgery. if she takes laxatives she gets diarrhea. what do you think is going on?