I'm having such a bad day anxiety wise.

I need to go to the lady doctor again soon and i'm so dreading it. I'm physically anxious and just cannot for the life of me stop thinking about it. 

Thing is, I know I have nothing to worry about! I can 100% rationalize that there is nothing to be anxious about. Like most of the things that make me anxious,
 I can rationalize them, but I never suceed at stopping to think about them

Why wont my mind listen to me :(