Junie, nothing anyone can say or do is going to take away your total devastation at the moment. But time....- a lot of time does slowly help. My youngest child died at the age of 25, a dreadful accident - no chances to even say our goodbyes. This was 22 years ago, but I still talk to him so much and have photos of him all around my flat. I am fortunate in that there were other children and since then, g.children.
Nothing ever replaces the loss of a child. However, in that deepest of grief, I knew that the last thing he would have wanted was for me to waste the rest of my life in grief. I have to live for both of us.
It will be two years or more before you can really start to get past this,, Take your time, be kind to yourself, talk to everyone and anyone about your son.
There are some wonderful grief groups out there, use them and anyone amongst your family and friends who give any support.