What a horrible thing to have to deal with.
I will share my experience, although it's not quite the same and I don't know if it would be helpful.
About five years ago I was having horrible nerve pain in the facial area. I actually went to the dentist initially, because it happened when I ate - especially if the food was hot, cold, or crunchy/hard - I would get this crazy, severe, shooting pain up through my face and nose, down my jaw, and it would last for hours. Turned out not to be a tooth problem, and it was eventually diagnosed as nerve pain - "atypical" trigeminal neuralgia (the "typical type is fleeting - just the same horrible pain, only for a few seconds at a time then it goes away).
So, the neurologist wanted me to go on tegretol (anti-seizure medication) every day for the rest of my life. But, I was still nursing my son, a one-year-old at the time, and wasn't ready to wean, so I declined for the time being. (Also, I didn't like what I'd seen of the side effects from observing other family members on anti-seizure meds.)
Anyway, at some point not long afterward, I had a bad asthma episode and my usual meds weren't working, so I had to go on a ten-day course of oral prednisone. I won't say it's been completely cured, but since that time I have not had the nerve pain return with nearly the severity I was suffering from before that.
I asked the neurologist about it later, and he admitted that steroids (prednisone is one) could work in that case, and I asked him why he wouldn't use it then? His response was "side effects". Well, ten days vs. a lifetime of daily pills - I'd at least try it! (Not too much later I stopped going to him, for that and other reasons.)
Perhaps something similar would be worth a try for your dh?
ETA - Oh, in re-reading your post, I see you are looking for non-medical solutions, but I have offered a medical idea, sorry about that.