I am really sorry to hear about what is going on right now. As much as I want to give you the words that will make it all better, I cannot. I know that there is a reason that you have come on to this forum. You know that we can give you advice here and tell you what we think you should do, but ultimately, I believe you already know what to do, and what you want out of life.
In my opinion, it seems like your wife doesn't have much respect for you or her family. I am truly sorry for your pain and hurting, but can only suggest help of someone who knows about custody laws, (for you to be able to keep your children), if you decide to leave. I don't know how your home life is, but I do know that you have many decisions to make about where you want your life to be years down the road.
I do wish you luck, with all of your endeavors, and hope nothing but wonderful things come of this. Take care..