@Shazz66 So Sorry for the loss of your son. Sudden death often makes the grieving process more difficult.
I found lighting a candle, journalling, poetry, music and collecting photos and putting them up on the walls helpful to deal with my grief.
Or you could have a special box with all sorts of things to remind you of him. Things that were special to him or to your love for him.
I can only imagine the level of grief from the loss of a child.
Unfortunately I did have to manage a lot of grief whilst raising small children and that is extremely difficult. I also had no calls or support from my big family. The world is what it is and over time we learn who cares. My family now is very small.
Take Care