I am not sure but think possibly Covid worsened my IBS. I was getting occasional IBS symptoms prior to early 2020 but those were quite rare. Then just before I got Covid I had a week long episode which cleared up. Then I got Covid April 2020.
Now at first, when I had cough, fever etc, my gut was perfect. It was great because I could eat anything I liked and had many comforting soups and stews, onions, garlic, oranges, etc. It was like a holiday....with a short fever. I got better slowly from it though it left me with heart palpitations and weight loss and some weakness, but slowly I got my strength back and gained some weight again.
My gut was still fine.
It was about 6-8 weeks after Covid went that the IBS came back and just stuck around and hasn't quite gone since, though I get remission periods when I can feel quite good, and those are a bit longer now.