Our boys are on stimulants for the ADHD-like components of their autism. It made a huge difference in difficult child 3 especially, it was the stims which turned around the language delay.
Have you read Temple Grandin's books? "An Anthropologist on Mars" and "Thinking In Pictures" - she talks about the WOW factor, for any treatment or medication. She says that if you try something and notice a fabulous response, like, "Wow! What a major improvement!" then clearly you keep it up. But if you don't notice much change if any, then why bother with it?
People with autism can vary a great deal from one another. A lot of people look at my boys now and say, "But they're not autistic!" (they don't live with them). difficult child 1 has perfected the art of being considered eccentric. All he needs now is the bank balance to get away with it!
Seriously though, we got where we did by working things out for ourselves, ignoring a bad prognosis and just trying to help with what we could see they were struggling with. You need to learn to think outside the square and to teach them to do the same. Edward de Bono's books are also good. lateral thinking can really help find different ways to manage.
We told our boys that autism means their brains are wired and programmed differently, like the difference between Macs & PCs. As a text document comes off the printer, nobody can tell which sort of computer it was typed on, but each computer type needs entirely different software. In the same way, autistic kids need different teaching, to find their own way of learning that suits them best.
We found difficult child 3 learns best when he gets everything presented in one cohesive whole. He learnt to read and from there, learnt to talk, with medications helping. Now he won't shut up!
Marg