You know this; but I will tell you anyway: God loves you. You did not fail. You cannot *make* someone be a good spouse.
I am so sorry you haven't spoken with your kids for so long. Now is the time to reach out to the people that you helped in the past. Did you enjoy helping people? Did you feel good when you said words of encouragement that brought hope to someone? That was a gift to them, but also a gift to YOU. Those people would probably appreciate being able to reciprocate and receiving the joy of offering YOU support.
And, of course, post and vent here. I don't have any specific advice to give regarding trying to get you and your children back in contact--but I do know that the people on this board are good people. Please, do reach out to your fellow church members.
Me-43 H-46 M 12 yrs 7/09 T 15 2 grown kids bomb 7/05/07 H moved out 8/04/07 11/22/09 told him I quit;let's get ball rolling Mid Dec- he isn't sure he wants D End 2/2010-Starting to consider piecing