I tried to 'stay for the kids' but one day I just broke down and literally couldn't function anymore. I lost everything because something that doesn't work, just doesn't work. Happiness has a positive value on this earth and we need to strive for it. Today my kids are happier because I am happier and we are out of a negative situation. Their grades are better, their smiles are wider and they are flourishing. However, I suggest you definately air your concerns with a professional. It could be that you just need an adjustment and what a shame to end something that could be fixed.
Good luck in your journey.