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Have you been tested for autoimmune diseases?

"Pain killers" are by prescription. The OP can't simply decide that this doesn't work (or is too strong) and move on to another.

These are prescribed by a Physician and that Physician controls...

Only a Physician can prescribe, of course, and recommend, based on your past history and allergies as well as the progression of your arthritis.

I doubt you will be given anything stronger than...