My younger daughter is unable to control her thoughts or activities for more than a short period of time. Are you familiar with this syndrome?
Absolutely, I have it too, this is known as ADHD.
Yes, ADHD is similar and is characterized by by excessive activity or difficulty in self control. I think the two syndromes could be classified as cousins.
Yes, it was only until very recently that ADHD became the umbrella term. Many psychologists believe it belongs somewhere on the high functioning end of the autism spectrum.
Generally, individuals diagnosed with autism spectrum disorder show two types of symptoms: social communication issues and repetitive patterns of behavior.
That's true, which if you think about it is very vague. I know many people who are ritualistic people, but couldn't be further from autistic. 
Yes, I agree but there are extremes. Most parents notice these signs in the first few years of life.
Absolutely, when a child has autism it's very clear. It's been said the Ketogenic diet is really effective for autism symptom reduction, ADHD too.