Thanks for the replies, everyone

Obviously this is a pretty common experience with therapy. I agree that being able to get some kind of help between sessions is good. I ended up writing a super long tearful email to my therapist, who offered a call to check up with me, which was really nice and made me feel a lot better about things.

It's still kind of hard, but I do feel better, and reading everyone else's experiences lets me know I am not alone in it at all!