Need doctor -anxiety positive vibes

I thought today I somewhat diminished my anxiety for upcoming physical, but its rearing its head again. I was supposed to lose a bit of weight and didnt..only a few pounds I lost. Was supposed to take a BP pill but was afraid to. My blood pressure is always high, because of getting nervous ABOUT it being high lol. Its a vicious cycle. But she wanted to do a preventive pill just small dose, but because I know its a regular pressure in general, I feared it would go LOW from the pill. So I am already at two negative things going in. How can I be positive and not get super nervous AGAIN ?