Does anyone have any ideas on calming a 7 year old with autism and adhd?

My son has been diagnosed with autism and adhd. The older he gets, the more impulsive and hyperactive he becomes. It is often hard to deal with him, especially in public, because of his behavior. He is receiving Occupational Therapy once a week in school, and will also be receiving an additional hour of outside OT soon. He is not currently on medication, as the neurologists have told me that a lot of meds that work for ADHD have adverse effects in kids with autism. Plus I am nervous about the effects they may have on him. We tried Focalin for a while, which had no benefit and even seemed to make him more aggressive. He is also on a gluten free-casein free diet. Any informative suggestions would be appreciated.

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