Intense pain in face and eye

Hi Everyone

i've been in agony for over a year now, had a problem tooth which was finally pulled after fighting with dentists for a few years as they couldn't find anything wrong despite me complaining of pain. It was found to have a crack in it and was gangerene, unfortunately after it was pulled (upper tooth) I was found to have a hole in my sinus which didn't heal hence i then had flap surgery ( where they cut a flap of skin from the roof of your mouth and swing it round to cover the hole).

None of this however has helped the pain, it burns, aches, ( only in my top jaw) my eye feels like it has had acid poured into it, my ear blocks up, glands swell in my neck and i get a lump in my throat that makes swallowing hard plus where the flap of skin is i can't even touch it, and it's been six months since the surgery. The pain is undescrible, I can't think or sleep.

I have had two CT scans, sinus is clear, and have seen a neurologist who did never tests and they were clear aswell. No painkillers help and neither do the Lyrcia ( which is a nerve tablet)

i'm at my wits end, can anyone please suggest what I should do next. sorry this is so long, I hope i haven't left anything out

Thank you all

Blessings
Janelle