I went through the same issues with my children in 1997. I had tried to committ suicide and after coming home from the hospital, I found my children 6, 13 both girls were given to their fathers! I had raised my girls by myself and they were my life. I fought day and night for years to get my girls back and with a history of MI it was twice as hard.
I guess I am saying that there were days when I thought my life would end but I never gave up for my girls. I never regained custody,,,,,,my girls are now 20, 14. I missed their menstral cycles, first dates and the every day laughter! What I have now is the memories of living without my girls. I cannot regain anything that I have lost but I look at them now and with all I am going through, I stay alive for them, I owe it too them.
Have faith in yourself and especially God, believe me, it is one of the most difficult times you will ever go through.
I will keep you in my prayers.