Mourning the loss of son and family after the death of my husband

After my husband died, my youngest son (I have two) started to disown me. The first thing that happened was that I was told that I was not welcome to attend my granddaughter's wedding. The next thing was that I was told I was no longer welcome in their home. I wrote them an email in which I acknowledged that any things I may have said that hurt people I acknowledged and begged for forgiveness. This email was ignored. Conversations were few and spotty. I then received a card announcing that my grandson was graduating from his university in December. This was an announcement only. I responded with a congratulatory card. The final blow occurred this last week. I received a card with wishes for the holiday season. Inside was a typewritten message of all the things the family had done during the year and some things that were coming up. Among this was attending my grandson's graduation. This announcement was specific. All the people who would be attending were named. And you guessed it, my name was not there. All of this rejection has caused me great pain and a lot of crying. I felt I could no longer go on like this. So I sent a short email to my son basically terminating the relationship between us. But I still remember the little boy I loved so much and it hurts. I can only assume that for whatever reason he no longer has any affection for me and I also assume that it will be a relief for him. I have heard nothing from him since I sent the email and I really do not think I ever will. I am 91 years old so am nearing the end of my life. I will never see him before I die. Right now I am in good health and I live independently as I can take care of myself and I drive - even at night. But I feel like this has been a death and I am in mourning.