I'm the only one left and I'm so alone.

I lost both parents years ago, but I had my sisters and we grieved together and eventually we carried on. A couple of days ago, my sister died suddenly and unexpectedly. We had already lost our other sister a few years ago. This time I am grieving alone. I am the only one left from my original family. I have nobody to grieve with. There is nobody else. She was all I had. I am not young and my friends have moved away or passed away or both over the years. Without my sister there is nobody. This is the most isolating, loneliest feeling in the world. Out of the desperation of having literally nobody to talk to I typed it in a search and AI sent me to a support group but the posts there are years old with no replies. It left me even more isolated. So I am here and it is probably more of the same. I don't know if anyone can understand this emptiness but at least I have found a place where I can say it even if nobody responds.