mighty_mommy,I dont know if your in the UK,or the US,but the best advice I can give,is to try these two links.The first one is The National Autistic Society,in the UK:
http://www.nas.org.uk/nas/jsp/polopoly.jsp?d=306&a=3353
Maybe they can give you some advice,and put you in touch with someone far more qualified than me.
The second is The Autism Society of America:
http://www.autism-society.org/site/PageServer
As above,maybe you can get all the advice you need there.