Psoriatic arthritis is considered an autoimmune disease and can be helped by following a diet designed to address autoimmune conditions. Nsaids may even exacerbate autoimmune diseases even while helping with pain. You can learn more about following an autoimmune protocol here:

https://www.thepaleomom.com/start-h...mmune-protocol/

I have multiple food sensitivities and follow a very similar diet to the one described. I have found Terry Wahls's book "The Wahls Protocol" very helpful. Like Nancy I have done testing through Enterolab which helped me identify my multiple sensitivities. It really is worth looking into dietary change as a way of treating your psoriatic arthritis.

Jean