DLA renewal help

Hello to all Relaxed I'm looking for some help and experiences from anyone who has been refused DLA when renewing. My son is 11 and is waiting for a diagnosis of high functioning autism with PDA traits. 

I've received a decision today from DLA saying he doesn't need any more help than a child his age normally would and I suspect they've spoken to his school and they've told them that he manages well while there which contradicts the fact that he bottles everything up and let's it all out at home, they don't see the small little worries he has day after day that can easily take over the whole weekend or evening and how badly this affects his already hard to manage sleep issues! I'm so angry as they have made me feel as though I'm lying and the fact that autism is sooooo misunderstood and individual to each person that whoever has looked at his claim obviously know nothing!