Yeh, sounds like you triggered. Bringing someone with you may help or giving him a call and letting him know you were triggered may help too.
I hate the word transference. I think a lot of T's use it as an excuse. Blech!
With your history and what you are working on it seems pretty "normal" that at some point you would get really scared. I'm sorry he didn't better help you get grounded before sending you off.