Was this over email or text, or in person?

I don't necessarily think that your T doesn't believe you. It might be that she's just unsure herself and is trying to figure stuff out. In that case reading your journal would help, whatever it turns out to be in the end. It's sometimes hard to tell what exactly is wrong and can take a while until it's clear.

However, if she really did respond that way to your things, I still don't think it's helpful. Even if you are making assumptions or get angry that she doesn't know your diagnosis, it's not okay for her to just stop a session if it was in a session. If it was via email I think it might be that she doesn't want to discuss this in such detail and to such lenghts without seeing you. It's hard to do therapy over text. So she maybe suggested that you try to relax for a bit and that you guys can talk about it tomorrow?