((((KUREHA))))
I'm so sorry to hear that you are having difficulty with the paranoia right now and I'm very sad to hear how you were treated by your nurse

. No one deserves to be treated as you were or told that somebody doesn't believe you when you are ill.
Is something different since you saw your nurse for your previous appointment? Is is possible for you to ask her why she doesn't believe you?
IMO I think you should be honest with your psychologist so he knows that you're not better and what you're doing is not working.
I hope you feel better soon and I hope you find the treatment that you deserve.