(((((Hope)))))
I understand you clearly as I have feel the same hell sensation more than once....

I have to scream everytime that pain comes as it comes like in waves you know... ouch....
I have to say lyrica helped me... I stopped it... then Vit B helped a lot too... had to stop it as well... now Im only under vit D and havent felt that fire sensation over the last weeks...

Hopefully it will last longer...
Take care.... I have discovered also that cooling my body helps me feel better when the burning comes...