I think George is right. There's something at the core of this that is eating at you and you either don't know what it is, or you're afraid to vocalize it. Do you KNOW what it is? Are you afraid to say it? Are you afraid of what people will think? Are you sick of married life? Is that it?
You do need to speak with a therapist and get some counseling. And you should do this before this rage really BLOWS and you actually do something. No one wants you to hurt yourself -- that would be a tragedy, and your girls would be devastated!!! Don't even THINK about it. Call your medical doctor -- talk to him and have him refer you to a good therapist. He'll know who you should go to. And get an appointment as SOON as possible, ok? Please do this -- it's not only for YOUR own good, but for the good of your family too. God bless and please take care, my friend. Hugs, Lee

P.S. -- PLEASE let us know how you come out, ok?