I had and still have it, but it got a lot better.
I think it's important to realize that MOST of the pain is muscular. It really is. When your current 'jaw position' tenses up your muscles this will lead to pain and can cause damage (obviously). But injuries themselves are often not the main cause of pain.
1) Restore the right position. Here you really need an expert. Many dentists just create a dental splint so you don't grind your teeth at night (prevent damage). But it is important that the splint restores the right position. When your muscles are tense and you take dental imprints to create a dental splint, this splint will not restore the right position (actually, that's quite obvious). My dentist used his fingers and moved my lower jaw in a circular motion to make my jaw relax. Kind of hard to explain. It is important that the dentist does something to make your jaw relax before taking dental imprints. If he just creates a random splint, you will see no improvements.
I don't know if braces are necessary. I don't know you and I'm not a doctor. I had success with a dental splint.
2) You need to see improvements FAST. Don't make the mistake I made. When you get a dental splint and you're still in the same pain 4 weeks later -> new doctor. This is a muscular problem. When a dental splint or braces restore the right jaw position, there has to be improvement when it comes to pain!
3) Meditation and exercises to relax on a daily basis. Massage trigger points (such as the masseter muscle). (http://www.amazon.com/Trigger-Point-Therapy-Workbook-Self-Treatment/dp/1572243759/ref=sr_1_1?ie=UTF8&qid=1346861475&sr=8-1&keywords=trigger+points)