I am going to be asking my doctor that same question!! I never had anxiety until I started taking Benicar and I am only on 10 mg 1x per day.
I would say any medicine that you start and then have changes you should consider the medicine to blame. I take toprel (beta blocker) for pvc's and pac's and the doctor said it should actually help with anxiety. I didn't personally notice any change in my anxiety. Maybe the doctor could change your medicine. There is alot out there for high blood pressure. Hope you can get to the bottom of things. Good luck