I've had burning pain all over my head. I always feel like I have bruises on the top of my head. This has been going on for years. I've been told by all kinds of Drs. that it's muscle spasms. Muscle spasms in your face and neck will compress nerves and cause this kind of sensation or pain.
Elaine & Crystal made a post of some very informative information regarding muscle spasms, nerve involvement, etc. They answered a lot of questions for me.
I think it's the topic where I ask them for more info.
(Massage therapy has helped me with this problem. She is trained in TMJD and has personal experience with it.)
I know it is a scary feeling, but in my case, it's just muscles pulling on everything they can to cause me misery.
Hope this helps,