In regards to children custody, we are in similar situations.
Yup, i had the same exact fears as you did. But with the advise of BITS in this forum, i understood the importance of being there in your kid's life. This weekend i spent time with my daughter reinforced that belief in me.
So stay strong and try to live the moment. It helps immensely.
BITS M 38 W 36 D 7 Married 15 yrs W left for 6 months in 2009 W Filed for D 01/03/11 piecing now...