My brother has had mild RA for 20 years. He was always a runner and has finished a couple marathons. Because he continued to run he us avoiding meds. Says endorphins work better. He does get pins and needles and some stiffness in his feet and hands. Yeah prednisone makes me feel much better and have more energy but it also destroyed much of the cartilage in my joints and caused considerable weight gain. I already have hip replacement, now being told I need new knees.
Good luck. Hope you are able to do your run

HIiiii half marathon what a girl!!! I have that under my feet when i walk, and for me atleast it is the lack of the bursa (fat pillow under your toes)that goes away due to RA, and that is a normal bieffect of the RA in feet. So everytime i walk or just put a little pressure on it the tingeling/needle feeling comes.
But in your case it can also be the start of tendonitis shinbone or something, as i dont know excact where you have the pain i cant say more. And i just state this cause i worked with top athletes for 5 years as an acupuncturist and saw that alot. Good luck to you to

I don't know about your feet. But you go!

Not triwd acupuncture, I had ra in say Feb and wasn't diagnosed officially until julyish so was in a very bad state, I had a steroid which was amazing! Felt like I could do anything then started my meds and as the steroid wore of meds had kicked in.. However it did take awhile to get correct meds tablets were giving me bad side effects so went onto pens which seem a lot better xx

That's good to know that someone with RA runs can I ask how long in till your med kicked in I have been on Mex since Oct 2016 and salazopyric since Dec 2016 but only the streiods seem to work have you tried acupuncture? X