I had Covid last Oct. Got severe diarrhea with it. That continued to this early April. Had blood work, stool samples that found nothing. I took probiotics, drank kefir, ate Activia yogurt with probiotics, tried the BRAT diet and fasted on just broth for several days. Nothing seemed to help. Early April took a trip for a week and took Imodium every morning, since I was going to be out and about every day and didn’t want to be chained to having to find a restroom constantly. When I got home I stopped the Imodium and low and behold, I was back to normal.

Gastroenterologist said they know very little on how Covid works on the intestinal tract. Not comforting at all. Hope you can find something that works. It may be that it just takes time.