Hi suedebottom (nice name!)
As a head/neck cancer patient (RT etc) I am surprised you wasn't referred to Maxillofacial at your local hospital - do push for it.
Maxillo were brilliant - I had a real phobia of my local dentist attempting to do any work on extractions. (My fault - not the dentist)
There are no facilities for hyperbaric oxygen treatment anywhere local to me. I have heard of their efficacy.
good luck - tony k