Dan, much sympathy and I realize you don't want to discuss the problems of teaching but find some new path, so I'll spare you my education theories.

There are sizeable numbers of midlife people re-tooling into medical fields around here. If you live near any medical centers, you might research the possibilities. Your organizational skills could be of great use in hospitals and clinics. You might need to pursue a degree in hospital administration.

There are also 'allied health' degrees which basically train you, often over 2 years, for a specialty such as respiratory therapy, or being the tech who does echocardiograms, x-rays, etc. etc. You might like working with patients permanently or you might use that as your transition to learn about patients & medical stuff and then transition to administration.

Anyway, education is a mess, so I hope you can find a better place. Other fields also have their frustrations, but not nearly as much sheer stupidity as the classroom teacher faces.