Yes, I know. The whole thing is so very frustrating - and mental illness is terribly complicated because most people simply do not "get it". (That includes mental health professionals.)
I'm very sorry to hear that your husband isn't being supportive. It sounds like he's supportive of your daughter; I wish he'd understand that he's modeling behavior for her by the way he treats you.
As for the ride with someone

. OMG, that would send me into a tailspin. I know it would be rather awkward, but I'm wondering if you could tell the person, "I apologize, but I am so anxious right now that, if you don't mind, I'm just going to sit in the back seat and try to calm myself" ?