I am so sorry for you! Here in Canada there have been lawsuits brought against parents by the grandparents in order to have access to their grandchildren. It had nothing to do with JWs, just acrimonious divorces and bitterness on both sides. I know, though, that if you are not well this probably isn't an option for now, but perhaps when you are feeling better you may think about it. I don't know what the laws are like where you live.
My thoughts are with you.