Second the advice on sauerkraut.
Plain simple no fuss no bother cabbage and salt. Grate it up, bash it around to release the juices, pack in with salt and it's liquid in a jar with an airlock of some kind and you don't really need to footer around with weights. I just press mine down into the liquid again a couple of times a week. Tasty, works well in a couple of weeks (surprised me, it's 'supposed' to take ages
and it stores well if you use kilner type jars, too.
German lady living in Ireland has a really simple demo, and I just copied Sandra's.
I am off all painkillers, all anti-inflammatories, all antacids, and I have no pain, no inflammation and no stomach ulcers or heartburn, or bloated tummy either. Fermented cabbage a couple of times a day, a pudding spoonful at a time. It's quite nice to eat
doesn't smell bad, and it doesn't rot your teeth either
The other thing that's proven to be a lovely facto-fermented pleasure are lemons
really nice as a flavour boost on plain rice or salad, and I'm told that it's brilliant with roast chicken.
I have lived pretty much gluten free for years, it's no longer the case that 'any gluten causes issues', and I can now eat some. I don't think I could do it every day, but as an occasional thing, I seem to be fine.
I'll find a link to Sandra's video and add it onto this post.
I hope things settle for you asap
M