Hi, I'm sorry to read about your chronic pain from your teeth, it sounds as though you're having a terrible time it must be agonising.
I'm assuming at this stage that you are no longer taking the carbamezapine, is that correct? Its good that by taking 200mg x 3 that your TN pain was under control, but now it seems to have returned with a vengeance and I sympathise.
I'd hate to think that you are having a bilateral problem, I would advise to get this checked out as quickly as possible and seek help from a neurologist as you should not have to suffer so badly. The quicker you get your name on the list the better.
In the past I've taken up to 2200mg daily, I couldn't function properly of course and spent most of my time in bed, and that was the stage that I had an mvd. But as always it was with strict supervision and regular blood tests and most certainly not recommended!