Like yourself, I want to please others as well, and dislike being the one to tell someone what and what not to do.
I was not presented with a probationary period, as you stated.
Stepping down within the company is not something I am interested - I feel I need to leave the company.
I really like your suggestions for starting below management through a different employer. It is a great legitimate reason for stepping back. Thank you for pointing this out.
The work I bring home are the stresses of my job. All I can think about is what I did that day at my job, what I should have done differently, what I forgot to do, what I should not have said, what I will need to do the next, and how much I do not want to do those things. I am worried that I will not be able to do all that needs to be done, and that I will not complete my tasks in a perfect manner.

Thank you very much for your response, healingme4me! I hope all is well with you.