I remember that you said two of the indications of adrenal stress is a lowering of the voice and sinus issues, and I have both. I used to be a soprano, but now my voice is dull and I sound like I have cotton in my cheeks. My question is: presuming my problem is adrenal, if I address those adrenal issues, nutritionally, will my voice return, or is the damage to my vocal chords irreparable?

For this issue, I would start with acupressure:see the video below. Apply the technique to your vocal area. Then I would sign up for the adrenal body type membership site for the advanced techniques. https://shop.drberg.com/dr-bergs-adrenal-body-type-exclusive-membership-1y