emptyshell lovey, I sat reading your post with tears in my eyes. It's not my place to say "don't go", it's not that easy is it, but please, do what is right for you but don't leave us altogether, keep in touch.
You "know" me well under my alter-ego and have been kind enough to speak out for me when certain types have got whipped into a frenzy on here.
I've been avoiding the Doghouse for a while - unlike you, when people are deliberately offensive or cruel I might call them a cunt rather than get upset. Not a word I use often but for some, deserved. There have been a few too many of them recently so I thought discretion might be the better part of valour and just avoided the Doghouse instead of letting rip at certain folk.
I'm damned if I'm reading this post without speaking out though! I don't know what made me look here for the first time in a while but I'm glad I did. The person on that childless teachers thread (which I have yet to read but will find and destroy the bitch in a minute) is just the sort of cunt I'm talking about. 
Can't be a teacher unless you have children? Bullshit! Tell that to 75% of my teachers, old-school spinster schoolmistresses each and every one. Mine was rated one of the best schools in the country. Tell that to my lovely childless, successful teacher 27 year old cousin - go on, I dare them!
Good god, my own DD needed a teacher like you, to protect her from an out of control bully. She wouldn't have broken down and be unable to attend school as she did had she found one. It's teachers like you who make the difference between a child surviving school or not - and for some children the difference between living and suicide.
Being a parent doesn't make you more capable at anything. For some it just shows up their flaws (I know it does for me, I'm an inpatient, intolerant cow!). Whoever said that the childless shouldn't be teachers/can't teach adequately has shown up her flaws big time and I really do pity her children for being brought up with such ignorant views.
The fault is with that other poster, not with you emptyshell, and don't you forget it!