Anxiety and cortisol

I have anxiety, depression and PTSD. I have suffered with anxiety from a very young age due to childhood abuse. My question is, are the blood tests that can be done to determine where my cortisol levels are and is it even worth asking about? I feel like I’ve been in the “fight or flight” mode my entire life (I’m 56). I have an appointment with my PCP doctor tomorrow for a physical and wonder if it’s even worth mentioning or if anything can be done.