I've been dealing with similar GI issues since early October. Had a third bout of Covid in June 22 and have had long covid symptoms since that keep changing from shortness of breath to palpitations to now the very uncomfortable GI issues. My doctor prescribed immodium but that worried me I might get too constipated. So it continues although I have put myself on an IBS diet. The one thing I did notice was that if I have an empty stomach for too long the cramping increases. Some days I have a bit of a reprieve but I have no idea why. And this came on very suddenly with absolutely no prior stomach/GI issues ever.