Weeks like that are very emotionally tiring. Do you have a video camera or does your still camera have video option? Perhaps you could record some of the behaviour to show as "evidence". It really annoys me when professionals have to make a diagnosis based on an hour of time, and usually the kids know to be "on" and behave their best just to complicate things. Video though, is hard to deny. I know they weren't sure with my DD either until I showed them a video of her melting down and lining things up. They suddenly went from unsure to "oh yeah, that's SO autistic!"