I don't think anyone is surprised that you lost your mind and were a dick to your daughter. There's been ample evidence that you're not the most stable guy anyway. But please please PLEASE don't leave 30 Rock. You're the heart of that show, the calm center around which craziness swirls, and presence which keeps everyone else funny (instead of annoying). And there just isn't very much that's funny on TV anymore.
Remember when you were Jack Ryan? You could have been the star of a successful movie franchise, but you turned it down and let some lesser-known actor carry it forward and take the glory. You're a good actor who is single-handedly saving the reputation of talentless family. Through all your missteps and triumphs, I've always loved ya, man.
I can't begin to imagine or judge what's happened between you and your family, and what would cause you to say what you did. I'm glad you've apologized and regret it (although do you really think Dr. Phil has the answer?) But I also know that an acrimonious disintegration of a family can cause people to say and do stupid things. And being in the entertainment industry means that sometimes things that are very private inadvertently become very public and are amplified by a 24-hour news cycle.
Don't let the bastards drag you down. You're better than them. We need you.