Welcome to the wonderful community of Living With Facial Pain! It sounds like your husband has truly been through a lifetime of dealing with facial pain. I’m sure it took a lot of resilience for him to try all those different types of treatment and still have the perseverance to move on to the next one - I hope that this copper supplementation he is trying now proves to be a revelation. Hopefully being a member of this forum also helps provide some useful advice and a network of peer-to-peer support for your husband - probably not as comforting as a cute kitten but hopefullly the next best thing haha.
Otherwise, I encourage you to start getting involved in discussions (“Welcome” tab provides some good beginner tips) and to let me know if you have any questions.
Good luck!