OP I did.
I worked as a nanny for about 10 years and prior to that was 5 years in preschool.
I needed and wanted a change. I didn't nanny again for almost 6 years.
I had forgotten the love I had for it. And to be all honest, I've grown as apperson and I've finally realized who I am. I know I am a lot calmer, I have more experience (not only with nanning but with all people and in all situations). I take things as they come and don't stress.
I'm glad I took off and discovered who I am.
All of my nanny families since than know I did other fields of work and don't seem to mind. In fact I can relate more to some of my bosses work (as we have done the same thing) and it helps bridge the "gaps" MB/DB and nanny sometimes have.