I am truly sorry for you loss and this is a terrible loss. As a mother who has also lost a child, I know that there are no words that can be said that will provide you with the answers that you need. Your son was truly a hero and he brought joy to all who knew him. Your grieving will not become easier, nor will it ease with time. You will simply learn new ways to deal with it.
There is some peace and comfort in knowing that he was so loved by so many and that our world was a much better place with him in it. You can try to fill the empty hole in your heart with your loving memories of him and the knowledge that he was so special and so gifted. You and your family are in my prayers. If you ever need to talk, please know that I am here for you.