Hi. You are a very kind and caring wife to help your husband so much. Now this is just my opinion but I think the final choice about treatment should be his. I know my mom did so much research and encouraged me on certain treatments but she said I needed to make the final choice. She said she would feel so bad if something went wrong with the treatment and she chose that. Obviously it would not be hurt falt or would it be your's with your husband. I do feel though for the overall relationship it is better for the rsd suffer to decide.
On a side note I was suggested a scs but after my block and lidocaine infusion increased my pain level the scs was put on hold due to the fear it would as well. I bring this up because you stated your husbands block increased pain. For the Scs I know a few people who have had benefits but also some who have had more problems. It is a hard choice I do know.
Sometimes for meds adjusting the doses can help and also time