Recently diagnosed with osteoarthritis in my jaw

Hello! I’m 43 and I’ve had jaw pain and crunching for at least 2 years and last week I’ve been diagnosed with severe osteoarthritis in my jaw. I also have had pain in my hip/pelvis and recently my thumb so I’ve had a blood test today for rheumatoid arthritis. I’m getting my head around this diagnosis and wondering if there is anyone here who can give me any words of advise and positivity. What lifestyle changes should I make? Food, exercise, meds, work? I’d love to talk to someone in the same boat xxx