Ouch! I can understand why you bite your tongue, or your cheeks. I am sorry that you have to go thru that pain.
I myself, when I get anxious tend to grind my teeth. Not really grind hard, but just bite down on them hard. After a while it starts to give my jaw a good ache and the rest of my mouth just hurts like heck.
I do it so subconciously that it is hard to stop and I even find myself doing it in my sleep. I wake up with bruises on my side from my wife hittting me to make me stop (that was a joke, but I do do it in my sleep)
Mine seems to come and go, but if you concentrate everthime you do it and tell yourself (even out loud) STOP. You can stop yourself. Try chewing gum or sucking on a piece of hard cand for a while.
I hope this helps.