Don't give up. Make the appointment you will need more help in two months, this isn't going to be a short term thing. Go see the veterans advocate. Maintain as much contact as possible with your children, maybe through your wife or her family if nothing else maybe they can let the children know you tried. Seek help through a church for maybe monitored visits. Send the cards. This isn't going to be easy, you need help and will need help. Borrow the money if possible from friends, family, anywhere you can and hire a lawyer. See if there is a single/divorced parents group that offers advice or support.