In reply to tk421:
I've done that. Where it hurts when you tension a flexed distal joint (ie. the one furthest from your hand) not your proximal joint? ie. open-handing things hurts but crimping is fine?
If the pain is in your forearm then as I understand it, it is hard to tell if you have injured the muscle belly or the tendon where it attaches to the muscle. If it is the former, then the recovery time is quite good - I think I was back climbing in 4-5 days, trying hard routes within 10 days or so, and probably totally healed within a month. Do the usual things - rest, ice, NSAIDs etc.