This is great! I love the way you have Harry internalize his external world.

I love the way the diary isn't just a focal point, it's a fulcrum that everything revolves around and that creates it's own leverage on otherwise minor emotions.

Also, you did such a great job keeping the tone if a youngster, which gives the dark intermingling with it so much more punch. 

And the accretion of stressors is really well managed. 

Wow. love it all!