There is a chance you have atypical trigeminal neuralgia.
You should try to find a neuro who has exp. in this.
An MRI can rule out TN 1, or classic TN. But your symptoms sound more "atypical". The meds most known to help are Gabapentin and a Tricyclic AD, like Elavil or Desipramine. Heat on the area might bring a little temp. Relief. I'm so sorry...sounds hideous and the dental prof. is often clueless or WORSE when it comes to this topic!

I was at the Mayo this week. I had a ct scan, bone scan and MRI. Based on the ct scan, the radiologist concluded I didn't have findings for Trigeminal but the spot on my back lower jaw where I had the tooth pulled is still showing up. I see a neurologist this week. I could be wrong but I think the doctor's are trying to decide if I need to have surgery because the jaw bone is not healing or if I need to be treated as a nerve case. I'm in pain as I type this and hope they figure out something soon. You are right, the heating pad helps tons.