It's been more than three years since I've gone to a therapy session, so pardon my fuzzy memory. Biofeedback did help me a good amount. I remember I went to a fair number of sessions, but I was improving after three or four. I needed to do alot of practice exercises between seesions though. As far as if it is permanent, I did the exercises enough to the point where I can reflexively engage in them, which really helps me control my anxiety and its symptoms.