1busybee - I am SO sorry that I did not get to this earlier!
You are a great mum because you are on the case. And your son is having problems because he is not a 'bog-standard' learner, but is having the wrong expectations placed on him ie the expectations that would be right for a bog-standard learner. Your son is unique, and is entitled to education to meet his needs.
It sounds like you really need a statement or at the least an assessment.
Your dear child should not be being blamed for things that are not his fault and behaviour arising from sensory overload is the school/LA failing to meet his needs, not his fault.
Behaviour like touching hair, and policing the classroom is behaviour caused by Asperger's so not his fault, and could be prevented/controlled if his needs were being met.
I strongly recommend calling the National Autistic Society Autism Helpline Number: 0808 800 4104. They can get you a trained volunteer to help sort out requests for assessment etc.
A really good ASD specialised Ed Psych report will be the best money you spend, and if you can afford it, a good Occupational Therapist and Speech and Language therapist as well.
But definitely start with the helpline as timing the reports to fit in with what the LA say about your request for assessment could be important.
By the may, some LAs routinely refuse to assess in cases like this, but you just appeal, do the assessment yourself if you can afford it, and most then back down.
Good Luck