Good to see you again DM32ASA. I hate you are now dealing with this but the good news is there are a lot of advancements in this area. If your surgeon isn't concerned please find someone who is. Maybe have your dentist make some calls. Get on it fast and hard and get something done. I assume you are speaking of ORN.
Current trials are under way in Europe that combine a lot of things tried here. Things such as HBOT, Pentoxyfilline/tocopherol with a bisphosphanate are among things working. Even some studies by PerioSciences found improvements by accident when trying to help xerystomia.
You are in a state that understands this very well. Be your own advocate.