Reading this just reminds me of Temple Grandin lecturing on her experience with autism and treating autism. There are so many behavioral treatment options in addition to prescribed medicine that can help autistic children.

Video Here: http://www.youtube.com/watch?v=2wt1IY3ffoU#t=5m20s

I'm not on the mother's side with this one. Try the treatments that have worked for others before you throw weed at the problem.