Your cortisol is low for specific reason, you need to find out why, Having labs are great but it does not tell me anything about possible underlying pathology. You are dumping zinc for a reason you need to find out why. You do have cortisol issues, but if you in majority of cases I work with when you correct the underlying issue which is a hidden stressor then you bring he body back into balance over time. This did not happen over night and will not get resolved over night. Some self proclamied guru on line probably told you to supplement with HC which is last case scenerio. I have been down that road and it took me 3 years get off the crap which I never needed in the first place, but set me up for a huge chain reaction of chasing hormones, and labs results just like many other people. Once you identify and address the underlying cause then alot of your issues will get better over time. It takes patience and a good health professional to sort through all the BS which is out there. There is plenty of it which I have fallen for over the years trust me.. Many times its the blind leading the blind, the same people are where they were 5 years ago with little improvement if not got worse.