Last of the Breed
Do a search for tendonitis threads cause that's what you have. I'm currently trying to get over it.
Ice it. Lots of ice, several times each day/evening if you can. Rest it. Seriously. Don't even be tempted to shoot your bow as that will only set you back.
Do some research on it and you'll find lots of different things to try but the biggest thing is plain old rest.
Good luck.
I haven't shot a bow in almost 2 months now and it sucks. It is slowly, and I mean SLOWLY getting better. I'm hoping to be able to resume shooting again by the end of March.