ejs, I'm not the most knowledgable person, just know from my own reading and experience, but I don't think a drop in systolic from 120 to 110 is enough to cause dizziness. What were your diastolic numbers?
ie: 120/? and 110/?
But dizziness from the cortisol, I wouldn't know about.
My opinions only, not medical advice. Always follow advice of your Doctor, not what I say here.