Jaw pain during oral sex

Ai
I really really like giving head, and My husband has told that I'm pretty good at it. But I cannot, for the life of me, go longer than five minutes or so, so I never get the chance to finish him off that way, and I would like to be able to every once in a while.Yes, I take breaks where I continue to use my hand(s) and I'll do some licking or other non-jaw-oriented moves. But if my jaw was hurting before I took a break, as soon as I continue with the mouth in-and-out the pain immediately returns, so breaks don't really help much.  I know the first thing you want to scream is "TMJ!", but I have never had any other symptoms and I really don't think that's the problem.I also have given head from pretty much every imaginable angle, and none are better than any other.  Lastly, please don't say "oh he's just happy that he's got someone down there to begin with, don't worry about it" or "finish him off with your hand, he'll just be happy to orgasm", etc, etc. I just really want to do this for my own satisfaction.  So, I'm looking for possible exercises, stretches, or techniques that you have used to overcome this problem, or any other suggestions you may have.  Thanks!