I have had gastric symptoms since a covid infection last November which sound pretty similar. I’ve tried lots of meds and alternative treatments and have been trying to stick to the FODMAP diet, but I think gluten may be the culprit. I was feeling slightly better until I ate at a potluck over the weekend which really set me back! I waited ages for an appointment with a GI doctor but it was pretty disappointing and he couldn’t really offer anything that my family doctor hadn’t tried. It’s the unpredictable nature of these symptoms that make it so hard to manage, so it would be great to single something out to avoid! Good luck to everyone and keep trying!