Hi,
I am sorry you have facial pain. That burning can be relentless. I felt just like you, could not understand the burning in face and scalp.
I have diffused burning and numbness all over, up on scalp and face, even inside nose and ears. Even my gums are numb. I have small fiber neuropathy, but symptoms are starting to get better now with adjustment of medications such as Methotrexate (for underlying vasculitis) and for pain control a combination of Lyrica and Amithriptylline. Actually, Ltrica is being slowly tapered until we can find a combination of as little as possible Lyrica. I actually think my vasculitis is better.