I too have a form of RA, but come back sero negative when tested, for it.
My ESR is in the 40's thats good for me, can be as high as 70's, my rheumo tells me there is no question I have a arthiritis going on, they just cannot give it a name.
One of the first things she mentioned to me was get onto odourless Fish oil, 1000mg capsules, 6 a day, 2 for breakfast 2 for lunch and 2 for dinner, with food, it does work, I noitce the differnce if I don;t take my fish oil.
Only thing you have to be careful with is if you are on blood pressure tablets, you need to work with you regular GP to monitor where you are going there, as they do drop your blood pressure.
You have to work/play without cuasing yourself too much pain, as that pain is inflamation, and that inflamation is causing damage to your bones, you really have to pace yourself, as the exercise is doing you good, as per other postings.
As you are a newbey, you have a long way to go with medication, you will find your Dr's will try something else if the current meds are not working, over the years I have worked my way through a chemist shop and finally found a mix that keeps me sane, and reduces the swelling especailly of my hands, my hands are my biggest bugbear, as it stops me doing things, imagine wearing boxing gloves, and trying to do regular household duties, impossible.
I also have had a double hip replacement, and that has helped with arthiritis in hip joints, no pain coming from hips now, and all that pain I believe doesn;t help with the RA, they tell you keep your stress under control, isn't pain stress, you wouldn't think so the way some of my Dr's have treated me.