Hello there,
Like others I cannot imagine what it must be like to lose a child,and even worse an only child too.
Although maybe I can imagine it,but it is a thing so terrible and scarring that I want to turn away from it,and not look it in the face.
I must be frank and say when I read your question I didn't want to reply.
Why?
Because I can feel the hurt and grief that you are still going through,and I didn't want to suffer the feeling too.
However,I quickly realised that this was incredinly selfish of me,so I am writing this in the hope that sharing your grief (yes and anger) with others may help to spread the weight of this terrible burden.
My wife and I are very lucky that in our extended family(four children and 6 grandchildren and so on) we have never had to suffer something as life changing, and possibly soul destroying as you have.
I shall not try to give you the usual trite and oft repeated words of (possible) comfort,such as it gets better,or be happy for your child would not want you to be sad,you have no doubt heard them all before.
There is no explanation for this,any way(anger,tears,seclusion etc) that help you are your own affair,and you must(and can) deal with this in your own way.
The hurt(as you feel it now) WILL go.The memories (good and bad) will not.
We are vulnerable (terribly so) as human beings,but we can repair given time and support.The very fact that you are understanding of angry posts shows (to me) that the process of healing and reconciliation has started.