KB welcome and I am sorry about your husband. I am sorry your husband is having such a hard time and taking it out on you. Is he under pain doctor treatment? Has he thought of seeing someone to help him cope mentally?
I think it is so important for both side of this to talk about how they feel. Keeping things inside is not helping anyone. You can tell your husband how you feel you can't make him happy. Ask him what could help him? I think for you as a loved one it is important for you to still enjoy life. I know this is hard but going out with a friend to dinner etc can really help you take a break so to speak and regroup. There are support groups for families and people who have rsd or other chronic conditions you may want to look into.