How To Treat Severe Knee Pain Caused Due To Rheumatoid Arthritis?

I have RA which is causing severe knee pain on right leg. i m on humira, prednisone, dicyclomine, venlafaxine, which helps with pain but unfortunately I also have twisted a muscle on my left side which is taking forever to heal. what, if anything, can speed up some recovery. I am 73 (hate to admit that) but does age have a lot to do with any improvement. I am an active person - used to play tennis and also horseback ride at least three days week but not now.