I had gastro symptoms as my biggest covid issue. After 3 months and losing 15 pounds from diarrhea, no appetite, bloating, pain, diverticulitis, etc. I am now on a low fodmop diet at the direction of my gastroenterologist. Seeing a nutritionist to help. Also probiotics.
If necessary, take hycosamine. Keeping a very specific food diary with any symptoms. Low fodmop seems to be helping a great deal.