First of all, let me say that I am so sorry...
There is nothing so totally un-understandable as the death of a child. When I went to a grief group at Hospice when my dad died they mentioned that there was a separate group for those who had lost a child... that the loss was so totally different from those of parent's or grandparents or even spouses.
Also, I work at a funeral home. And while we are sensitive to all families, when there is the death of a child even we, the staff, are affected.
There is no way someone can say "I know how you feel" unless that same loss has happened to them.
That is why one of my first suggestions is to look for a support group for people who have had the death of a child. Hospice is good here in the states, and their grief groups are for everyone - not just those who used hospice.
It just plain helps to be with people who DO understand what you are going through and who don't say things like "you have to move on" (I hate that one!)
Another thing is to write your nephew a letter or two. Just sit down and write to him about missing him, a favorite memory or three, what you are doing.
There is a connection when you are writing that is comforting - you could end up with a small collection of warmth/caring.
Grief doesn't ever go away. It's as if grief is a huge jagged rock that has been tossed into the stream that is your life. There it sits.
Over time, the water slowly smooths away some of those jagged edges, and in time the jagged rock becomes a smoother & more familiar boulder that you can still visit to think about the person who died but without quite as much pain.
Is the depression you are feeling still affecting your ability to work, take care of things at home, etc?
If so, you may need a few weeks of an anti-depressent. Yes, you don't want to be on one forever, it's important that you still go through the grief process. But for a short period of time it can be of real help.
Let me know how you are doing, and if it is not too painful a little bit about your nephew. I remember that I wanted to talk to people about my dad after he died and everyone seemed so uncomfortable about it...
Share if you want to, ok???!!!