I can sympathise. Currently I am taking and extended layoff due to a bicep injury. If this injury causes sharp blasts of pain to shoot up your forearms I would listen to some of this forumns senior members advise. Personaly, I have experianced this and found through an x-ray that I had a few micro-fractures in my Ulna and Radius forearm bones that needed to heal. I know this might sound depressing but I firmly feel that the muscle tendons and ligaments need to be treated with care just like a fracture or break of a bone. I would first stop applying resistance to the affected area. You only aggravating the area. Apply some good RICE advice. Take some time away fromt the weight pile and let mother nature heal itself. It might take about 8 - 10 weelks or so. I know its real crapper that you cant train it but look at it in the grander picture 8 - 10 weeks is nothing compared to the following years a training you will reap but letting this injury heal correctly. Make sure to do some light stretching and maybe a little whirle pool therapy.
Good Luck
Sleeper