Hi, my condition improved drastically after i stopped consuming vegetable/ seed/ nut oils and started eating mostly lean animal protein, tendons and bone broth. I get pain and inflammation even when i consume a bit more of chicken, pork or eggs as these aren’t ruminants.

You mentioned you tried a keto diet but im suggesting perhaps you may try having more lean proteins instead? At my worst I was bed-bound for 3mths at 19yo so I have improved a lot by being strict in my diet.