Well I dunno much abt your job but u must have a little leisure time once in a while atleast.....
jot down all the possible jobs u think you'll enjoy doing and then the possible one's out of those.
You can think of possibilities when ur having lunch or times like that when your mind would be free...
I know how you feel Cuz I feel the same myslef but my circumstances r totally different.

I'm pretty sure u love the kids n other things abt ur job....but remember it's your life ur the only one who'll live it.... n down the road you shouldn't regret ur decisions Cuz that feeling is the worst...