Oh my gosh, Katy

. You know how Ralphie has always had a special place in my heart

. I am so sorry to hear of what's happening to your little Bunny.
Has he seen a neurologist or internist? I think you know about this place - this is where my furs go for specialist vets:
Arizona Veterinary Specialists
Have you had him stay w/ a good friend or relative for a few weeks to see if he has any reaction while away from home?
Does he have these reaction
every time he's around your husband? Is this a new marriage....as in, did you get married w/in the last 3-4 years or anything? What happens when hubby tries to play w/ Ralphie? Did anything traumatic happen to him around 3-4 yrs ago?
I'm so sorry for you and for Ralphie...I'm willing to help, just not sure what I can do...