
Isn't there some way you and your son can go to the fair without your husband? It seems to me, from your sharing, that your husband is involved in each of the incidents of your panic.

I suspect if you and your son could go and spend just a short time and leave that you would both have fun! Can your husband take you and drop you off for a while?
I would hope that your T could explain some things to your husband, but from what you share, he doesn't sound like he even wants to understand. You do sound like he thinks you're a burden to him...but that might be your disorder talking. See if he'll go to the T and find out ways to help you. Goodness, he's in no danger if you have a panic attack!!! Why wouldn't he want to help you and understand?
How old is your son? Can he help you if you have a panic attack? You know, kids can be really rational at times, and a big help if they know what to do.