I just want to say I feel you hurt and I'm so sorry what you have gone through/going through.
I have lost my grandpa and mom from cancer and feel the pain.
The only hope and comfort I have is that, I know they are free from pain and is with Jesus in heaven. What I also came to understand, is that God wanted them back with him.
I feel the same for your child. God loves your child soo much that He wanted him/her with Him. Yes, it is tough not having that person with you. But stay strong and be at peace, knowing your child is with the Almighty Father. And be in great hope and anticipation the day we will meet them again and to praise God together.
I hope this helps. I'm here for ya!
God bless! *hugs*