Hi there and welcome to the forum,yep,exactly as clkd says,cortisol/adrenaline,this is how I felt every morning,an I was awful and like you, I didn't know what I was anxious about,I'm pretty sure it is all meno related but good that your GP is double checking,some Drs are pretty clueless when it comes to the many symptoms,so do mention you are a member of this forum,it sometimes makes them sit up and take note