I have a daughter (7yo) who has some symptoms (flapping hands, very large blowups if she is touched, very poor motor skills, etc). My wife has searched for treatments for years. We have found something that is making significant progress. It's called Brain Highways. They have treatment centers in California and Colorado, I think. But they run a do it yourself program, which we are doing from Kansas. They use printouts, audio, and video, and questionnaires (submitted using Adobe Reader X - yuck!!) to teach the parents, who then direct the kids. This starts out being about 3-5 hours a week, and drops to an hour a week in later weeks. The program lasts for 4 months, but the child is going to be doing the physical activities for between 100-300 hours depending on how bad their symptoms are, which means up to a year. Could also help ADHD, Tourettes, or any other condition where the person has difficulty controlling their body.
How they explain these conditions is that the lower and middle portions of the brain, which are in control of unconscious body control did not fully develop while a baby. But by imitating physical motions similar to what a baby goes through, the brain development can be completed, and the person can become a fully functioning 'normal'. As it's explained in the program, your body is trying to compensate for underdeveloped lower portions of the brain by trying to use the upper centers of the brain to do the same thing, which that part of the brain is not designed to handle.
When the program starts, there are 4 physical activities to perform. Three are simple positional movements, and lasts from 5-10 minutes per day. Then the main activity is called creeping (pulling yourself across a smooth floor on your belly). This is supposed to be for at least 30 minutes per day. Each week, there are some addition physical activities recommend that help the person master new physical abilities, and these are typically done during breaks in the middle of the creeping. After 8 weeks, if the person (adults can participate) has progressed far enough in the creeping (changing arms and leg involvement), they can begin the second portion of the program which drops one position and add a new one, adds a few yoga poses, and crawling is added to the creeping, with a total combined time of 45 minutes for the creeping and crawling. This continues until brain function is normal, with you submitting video of your child creeping so they can assure you that they are progressing normally.
I think they run 3 cycles per year, so a new program will probably be starting in about a month when we will finish our fourth month. We signed up a few days before, and didn't have any problems getting in. Each half of the program is about $550, and if you want them to analyze your second child, they'll charge a couple hundred extra for that. Adults can also participate (I'm doing my own creeping, but I'm several months behind my daughter).
My daughter's progress has been pretty good. We were warned that some of her noticeable symptoms (arm flapping) would probably get worse after we started, because the lower center would start to take control of the limiting the action, but not be ready to do it, and the upper brain apparently loses the control it's developed. This has happened, a few times a week if she gets very excited, she will start vigorously flapping, which was mostly gone before. But other than that, most of her other symptoms are much better. She is getting much stronger and more physically adept. Her hand writing and drawing are significantly better than 3 months ago, her self control when touched is better but not complete. She has started shaking hands when required, and is in general much more willing to do new things. She seems much more at ease, and given a few more months, she will probably get to the point where strangers won't even notice her differences. We hope that she will be done by mid-spring, although maybe she'll be done earlier, or maybe not until later next year.
It takes commitment and hard work, but as the found says in some of her later videos. Which is more difficult, living with these limitations for a lifetime, or taking 6 months to a year to fully engage the brain so that it can work the way it's supposed to.