Buster, what do you want from us? "Permission" to quit? Since you've come on here, you've whined, complained, and told us every reason why everything we've suggested won't work. All you've done is feel sorry for yourself, from where I'm sitting.
Look, I know the hand you've been dealt SUCKS. I've been there -- remember? Pain has come to pay you a visit, and you have a choice as to what you do with it: let it consume you, or push your way through it.
We can give you specific techniques and suggestions to help you do what it is YOU decide you want to do. But we can't make the decision for you.