Longest I was with the same therapist was 3 years. I didn't make a lot of progress because I wouldn't take the meds that helped. Plus I didn't realize some of my symptoms. It took a bunch more Dr's before I had the true label and meds I needed. I'm treated at high risk so very few therapists want to work with me and the ones that do stick with me do get sick of my issues. I finally have a pdoc that I trust and reads my therapy notes. Maybe something else can help your anxiety. Also my paranoia shows up as anxiety. So if you have extreme anxiety make sure it's actually anxiety. For me a second AP made my "anxiety" to a manageable level. If you aren't getting anywhere and you feel like your trying everything look into different meds.