Yikes. Sounds kind of sudden. Sounds like t wants you to get better. You've said here (don't remember if you have said that you said or emailed it to her) that you feel like you are getting nowhere with this and that you just can't open up.

I think if it were me, I would want to have at least one more session with her before making up my mind. This does not seem like an easy choice. TBH I think I would write out what I need to say about the health anxiety, take it in with me and try to say if, if that didn't work I would try to read it, and if that didn't work I would hand it to her. But that is just what I would do, based on my attachment and trust issues.

Hugs.