I've been dealing with this same issue for almost six months now, I've seen physical therapists and occupational therapists. So far nothing. They've all given heir two cents but really can't tell me much about it. The most I got was that basically the muscle lining is pulling from the muscle. Ive tried MFR, rest, even series of extensive dry needling and nothing has helped. Probably not the best idea, but I've just been training through it. My forearm is at the point that its pretty tired and taking a beating, but I honestly think it could just be the nerve. It doesn't stop me from training for stop megrim progressing, it just hurts.