Seeking Support for Parental Alienation

I'm trying to connect with anyone who has been alienated from their child/children. I don't understand how this happened to me, but I can say that it hurts me so bad. I have no one to talk to about it because all I ever hear is, "just call them or write a letter." No one understands that they won't talk to me or have anything to do with me. From the time my children where born until shortly before being evicted during divorce I was the only one who ever did anything for them! I only asked my ex to take the kids until I had a place to live to which he agreed, but I never got my kids back! The heartbreak over everything I have missed is horrible and gets worse all the time. My two daughters are both engaged plus one daughter now has an almost three months old little boy. I want to meet my grandson! I want to see my girls get married! I can't think about these things as they just make me cry!