I'm sorry you're getting this terrible pain. I think you should explain this to your doctor and mention the collision you had during hockey. Maybe its from the neck injury or perhaps you had a concussion. My daughter used to be in Karate but we both decided it wasn't worth the risk of head injury. Did you know that repeated concussions can have an accumulative affect and cause psychological problems - especially anger and emotional problems. Get this thoroughly investigated and I hope you feel better soon.