In your husband's case, even if an allergy to sweat isn't the issue, many dermatologists I saw told me that it was a condition linked to a sweat dysfunction at the very least. I hope your husband finds something that works for him, it really is a nightmare to live with. Who knows, maybe some day my stress will increase enough that it will come back full force. For now though it really seems that having some outlet to put all that stress in perspective is helping tremendously. I just happen to be one of those people who has a very hard time just sitting and calming my mind by choice. I tend to obsess about things, but for some reason snake handling time just kicks me right out of that cycle. None of the problems seem to matter enough to take away from the happiness I get from interacting with him. Maybe it provides just enough of a time out from the panic cycle that I can move past it. Very interesting either way, just never would have expected that particular benefit to having him.
He definitely is happy holding on to our snakes, but it doesn't necessarily stop him from stressing.