The only thing I've in common with your husband is I have Raynauds too. I have tried the Calcium Channel Blockers, and they did not work for me. I did not suffer any of the side effects that you listed so maybe they won't be so bad if you had to try them.
Another thing you might want to try if you have Raynauds is Cayenne. That's what I use when I find I lose circulation in my hands. I make a bit of a hot drink out of it and I can sure feel the blood return to my fingers!