Tingling and Burning in Face and Body.

I've rectory had a root canal failure doing wrong. Dentist punctured my sinus cavity and I now have sinus snd tooth pain. Been feeling so anxious abt it abd 1 weeks ago all of a sudden all my facial nerves and scalp started tingling and burning and then it spread to my legs and feet. It's constant during the day now but at night face and legs go into a rapid tingling buzzing and then results in cold flash in my body, I'm very alarmed. I'm supposed to have a tooth extraction next week but very worried the facial nerve pain will get worse with the recovery of the tooth pain. I also don't understand how to calm and if the nerves. I'm not able go sleep or eat anymore because I'm so anxious about this, pain killers or allergy meds don't seem to helping. Seeking help and guidance. Thank you.