I have found that my vocal chords and my throat are like a canary in a cave. If they don't feel right, a cold, flu or other general cootie is generally right around the corner. Does this send panic through me as I set out to sing or act? Yes it does. Does the same issue hold true for public speaking? Yes it does.
It took me years to realize the value of replenishing myself and putting myself on the top of my to do list, of taking care of myself so I can take care of others. And at some point I really got that the key to happiness is to going deep inside myself and realizing that I was enough and that is what I call the process of unbinding.