Why don't you call his doctor and have HIM tell your husband that's where he needs to go? Have his doctor set up the appointment for him -- he's more likely to go if his doctor does this for him. At least that's been my experience.
See if his doctor would be willing to do this. Can you call his doctor without him knowing it? Can you make the call in another room or something? I hope so. Or else go visit his doctor yourself, and talk with him about it.
He definitely needs counseling from the sounds of it. I wish you the very best. God bless and let us know what happens. Hugs, Lee