Stifler,
So far the advice has been good. Up your protein to 1.5-2 grams per body weight, try to eat 6 protein rich meals a day ( 2-3 can be MRP's in a pinch ). This will keep you body in an anabolic state. Take your creatine, glutamine, flax w/lignans and a good multi vitamin. Also extra E & C vitamins wouldn't hurt.
Keep training and good luck. Remember don't over do it, pace yourself. It will take time to get back where you were. Get enough rest.
PS your good arm is getting more sore because if you are doing alot of barbell work it is pickup the slack of the bad arm. I would recommend dumbell work to properly stress you arms separately. This will also help get the strength and mass up on the bad arm more quickly. Take care. Hoped I helped.