I'm very curious, about 2 years ago i was involved in a hit and run accident. In the even of this accident i suffered from a TMJ injury which is in your jaw. It is a muscle injury that never gets better, they try to medicate it with 800mg IBUPROFIN but it never works for me. It VERY often flares up as it has cause grinding and other symptoms. The doctors have all diagnosed me and pretty much said there's nothing they can do, it is a life long injury. would this injury be considered intractable pain?