wow, I so sympathise as my ds is EXACTLY the same and it can be pretty unrelaxing sharing your life with a full-on child...on the odd day when ds is chilled out I can feel my shoulders going down and realise how NOT relaxed I am most of the time, because he is full on and demanding.
I think the reading thing sounds great and I hope it works. My thing with ds has been that he really hates having to take instruction from me, he gets angry and won't listen which is SOOO frustrating and has hampered him, for instance his drawing and writing are pretty awful (he's 4.10) and only today, this morning, did he finally listen to me giving him a little tip (I told him to keep him arm down on the surface when he's doing lines to help him control it) and lo and behold, his work was perfect.
I find his upset with changes of plan has not changed and he has been quite anxious and upset at school because he finds it difficult if the routine changes unexpectedly, he is incredibly resistant to trying new things as a result which again hampers him in some ways and has made settling into school an issue.
I'm rambling here, just know how you feel and how children like this can be quite un-relaxing to live with! However ds IS improving with time and maturity so basically I think the answer is yes he will grow out of it to some degree, hope the being able to read will be a key for you, because it is a huge bit of independence for them.
The other key I believe is accepting him wholeheartedly for who he is; as you say these things aren't silly because they are important to him.
I'd just say that with the general 'demanding-ness' and lack of patience that you mustn't feel bad about being strong with him at some times, when you absolutely can't give attention. It's a good lesson for them to know that you can't always get a response immediately...but give him time, ds is still learning this and still tries to sabotage phone calls and interrupt his teachers