I think my voice worked out fine, but it was a lot of work for me. And I was very self-conscious about it. I was a bit self-conscious about writing lyrics too.
Even such an obvious idea as to observe an animal with vertigo or to rotate an animal did not occur to him, in spite of the fact that he conducted numerous vertigo experiments with human subjects and made frequent use of animal experiments.
If you take an hour out of your day to meditate, you will progress ten-fold. By staying mentally focused, you can let your worries go.