I don't think there's anything wrong with emailing your T about your feelings. Who cares if it was right after session? He has apparently given you permission to email and you are exercising that right. I think you're giving him good information to work with. I think it's funny sometimes that some T's want us to open up, open up, open up...then when we do, they're taken aback.

I know how agonizing it can be when T won't answer an email. I just keep remembering over and over again that she my best interests at heart and while she sends short replies sometimes, she can't do therapy via email.