That is a load I cannot imagine. I am truly sorry, my friend.
I have had to deal with the loss of my parents and many friends over my lifetime but losing my own daughter is something I don't think I could ever really get over. I love her so much it hurts to be apart from her but she has her own life to live.
I lost the best friend of my life 19 years ago and I still feel a sweet sadness when I think about him and all the good times we had and the only thing that brings me any comfort is that he still lives on threough his children and that he no longer suffers but I will always miss him.
Death is as much a part of life as birth and just as inescapable. As long as someone thinks about us and misses us some part of us still lives.
In the long run we must all go home however we get there and our own lives don't matter as much as how we affected others while we lived and made them love us and made their lives better for our having been here. If we have lived well the pain of loss never goes away for those we leave behind but it does diminsh a little over time if we are able to love others and make their lives better for our having lived.
The older we get the more we become aware of our own mortality and the more we work on doing things for others so that we, too, are missed when we go back home. This is what drives me to use what I have learned to help relieve others' suffering so that someone will miss me and be glad I lived and made their lives better when it is my turn to go.
Some die and are never missed because they never positively affected the lives of others. Your suffering is a tribute to your daughter but in time you must help others, too, so that others will miss you and be glad that you made their lives better, at least that's the way I look at it.
If physicists are right, bodies die and are transformed into other matter and energy over the fullness of time but spirits never die because they are already energy and simply transform into other energy over time. Her spirit is still alive, you just can't see it but you can still feel her love for you and your love for her. She is now part of the underlying bed of energy of which all things in the universe are comprised. She is not only still in your heart but she is everywhere and always will be and that is a good thing because it is what life really is all about.
It is what makes doing things for others truly gratifying.
In my view, it is the way of things.
Your life is better for her having been here. What would it have been like if she had never existed? Surely less fulfulling not only for you but for all the others who found joy in her. In time perhaps your joy at her having come into your life and made it better will replace your sadness at seeing her go. I sincerely hope so.
I wish very good luck to you and yours, love them while you can for we are all transients here and hopefully we leave the place better for our having sojourned through here on our way back where we came from.