My grandson has Asperger's. This seems to be partly caused by his body's inability to process milk and milk products properly. Provided his diet is watched carefully, and he drinks soya milk instead of cow's milk, he does well at school, and hardly 'twitches' at all. (Some children/people also have problems with wheat and/or fruit such as strawberries.) Try cutting out milk, and see what happens.
His hearing is very sensitive - it can be a problem but it can also be a bonus as well, as he hears things in music that I am unaware of.