Burning sensations on face that sometimes occur with a read rash and sometimes does not. What is this?

I had nose surgery 2 mos. ago and experienced complications. Post surgery I was on prednisone, amoxicillin, bactroban, and vicadin). I developed CDiff and finished a round of metronidazole. I no longer have it, but being testing for Celiac. I am 3 months post surgery and about 5 weeks out I developed burning sensations all over my face (forehead, on top of head, back of head, nose, above lips, cheeks, and scalp). What could this be and how can I treat it?