sarcoid and now arthritis !

I have had sarcoid for three years and I think cope quite well, started in the lungs and now I just appear to have some skin, and I thought joints but my GP has discovered I have arthritis, was aware I had it in my knee through too much sport when I was younger, but I have it in my neck, wrists, ankle, fingers and thumb, so were do I go from here, only being treated with pain killers as my Gp says there is little more than they can do, possibly a knee replacement but I am not sure, any suggestions or ideas would be great, I als have a pacemaker, sarcs, and have COPD, so am quite fit really, regards from the UK.