I'm a bit late to the thread but wanted to contribute.
I lost my Dad to cancer when I was 11, he was 41 (I'm now 28). I developed anorexia as a teen and still struggle now with bouts of anxiety and depression. It has taken years of therapy and working through the grieving process to get to the place I am in now, where I am able to reflect on the time I had with my Dad, the kind of person he was and I really try not to dwell on what could've been. It's so hard though as now have children of my own (I well up thinking about the granddad he could've been)!
Many people say to me 'Oh it was years ago, aren't you over it by now?' but the truth is I will never 'get over it'. To this day I have a massive fear of abandonment and fear of loved ones dying (especially DH as he is close to the age my Dad died).
My poor mum tried to hold things together after he died, but she was grieving too. Life was never quite the same again. Therapy helped me accept that it was hard for her too and she did her best, despite me resenting her all through my teens.
This, and the fall out isn't talked about enough. It's brushed under the carpet, almost a taboo because people feel so uncomfortable talking about death. Having to face it as a child is one of the hardest things to go through, just when you are forming your attachments with people and perspectives of the world.
The article I've linked to is almost 4 years old, but I read it all occasionally and realise I'm not alone in how I feel about losing my Dad. I'm sorry for the massive dialogue here. I just wanted to say yes, OP I feel it too.
www.theguardian.com/lifeandstyle/commentisfree/2016/jul/26/losing-parent-in-childhood-prince-harry