How horrible! Not only do we suffer with RSD, but our spouses/caretakers suffer as well. I'm sure we are not that "fun" to live with. Nonetheless, your husband has seem to forgotten his wedding vows and the situation could've been easily reversed. I get the sense that he is a weak person, and is cowardly exiting his existing life (marriage) because it's not "perfect". Because of your disease, he may feel as if you are "broken" (not realizing there is a beautiful soul inside just a damaged vehicle) and is past frustration because he cannot fix you. So sorry you are end the VERY short end of this!! Definately not fair. I hope your suffering is minimal, at best, and that the Lord has better plans for you. Time will only tell.
God Bless you!!!

Vanna