I sooo understand your gut issues! I had covid in Jan for 2 wks and then a very, very short, mild case July 4th. My gut issues started after the 4th....had many stool samples checked for various possibilities, bloodwork ups, and abdominal ct scan with dye contrast....NOTHING.
(I have all my vaxxes and boosts)
What I am currently doing is taking a quality probiotic, watching diet for what may make things worse and taking miralax as needed....constipation seems to be an ongoing issue.