Barb,
HBO is a hassle, but it worked wonders for me. I had 5 surgeries post-radiation trying to deal with an open sore that just wouldn't heal. No mention of HBO. Then, after moving to the Seattle-area, my new cancer specialist insisted that I have HBO treatments before surgery #6. I had 8 weeks of HBO, then the surgery. It finally worked, the wound healed. Also, my salivary glands started working again, so no more dry mouth.
It is hard to make time for daily HBO treatments for 6-8 weeks. But the results in my case made the time, effort and transportation expense worthwhile.
Ken