Hi, I too have RA and two artificial knees. I was on Plaquenil for years. About four years ago, I was able to go off that. I found the pool exercises helpful but I go to a pool at a Rahab center which has steps into the heated water (sometimes 90 plus degrees which really helps stiff joints). Also it's not a "class" - we exercise independently so you can be as aerobic as it pleases you but you can do what helps your specific muscles, joints most as well. Before that I found the Arthritis Foundation tapes helpful too. I now take Tai Chi based exercises at a Sr. Citizen place (I'm 69) and have recently been able to get back to walking. For many years I subscribed to the Arthritis Foundation magazine and also took their self-help course.
I was on prednisone almost a year ago for a longer time than usual. This was because I needed to care for my DH and it involved a LOT of physical activity and did in my arthritis control in many ways. I'm working my way back from all that but have just done me in with too much go-go for the recent holiday. I think learning our limits is so important but I've not truly learned that lesson yet or I wouldn't be hurting as I am right now.
However, a warm shower and activity will help. I now am taking Clinoril for inflammation, MSM, vitamins, etc. I lost 45 lbs or so a few years ago, have mostly maintained with the usual ups and downs. I need to lose much more (another 50 would be nice).
RA is so individual, what works for one doesn't always work for another but I tried most things that seemed reasonable. It took me years to understand that I couldn't be down on me when I couldn't do things, that with rest, meds, healthy eating and small movements, I was able to do more long term than when I would push myself (again, as I did over the holiday). This was esp. true when I first was diagnosed and was only in my 40s and could push through a lot (and sometimes felt I had to). Understanding was hard to come by as I LOOKED healthy and all these ads where people take an over-the-counter pill and can then do EVERYTHING give friends/family the idea you're a malingerer. DH was always good but it was a long time until I got even him educated.
Each day I start over - usually with good reason. Be kind to yourself during flares. I also did hypnosis/meditation tapes to learn how to deal with the worst days. And would sometimes find things to do (like Christmas cards

) that needed to be done anyway and that I could do sitting down and resting. Even a little accomplishment counted and let my better times more free for things I couldn't do otherwise.
I wish you so well - it is a lot to deal with. The more you can learn and the more you try (with your doctor's approval where that applies), the more "control" you will feel. I've fortunately been able to "tame" the beast a little for now and have not had to go to any of the newer drugs but for many they've been a big help.
I do face foot surgery in March (second foot) to try to undo some damage so I can get back to more walking. So right now, I'm working on getting me in the best shape I can be for that. Note I said "working on", not always succeeding but today's a new day. Good luck!