Hi Saralee,
I am an occupational therapist and I work with many children who have been diagnosed with Autism or Asperger's Syndrome. I read all the responses to your question and many people gave you good advice. I would like to make some suggestions that I hope will be helpful.
I would advise looking for an occupational therapist who has expertise in sensory integration. Even better would be a therapist who is also certified to do a therapeutic listening program. There are a few listening programs out there. My experience is with Samonas cds and they have helped a lot of children. The program can be done at home with the guidance of a trained therapist. A therapist trained in sensory integration can determine what sensory systems your son might need assistance with and provide appropriate therapy. It could be the tactile, proprioceptive, vestibular. visual, auditory, olfactory or gustatory systems or a combination of some of these. The book The Out of Sync Child does a nice job in explaining sensory integration and it was written by Carol Kranowitz for parents and teachers. I have referred many children to practitioners for craniosacral therapy and found this to be helpful. You want someone who works with kids and has some experience. For an accurate picture of your son's visual processing abilities a developmental or behavioral optometrist would have this expertise.
In addition to occupational therapy I use EFT for the majority of the kids I work with. People gave you good advice on how to do EFT. I would add that I often use EFT to help a child decrease his/her anxiety and have found there are many fears kids have that contribute to their anxiety. I tap on the fears. If your child can't tolerate the tapping I would do it on a stuffed animal. Sometimes the child taps on the stuffed animal. I have been surprised at the number of children I have worked with who have tactile defensiveness but will let me tap on them. Some of the kids do ok with watching me and doing the tapping themselves. I have used EFT for kids who have sensitivities to noise because some of them develop a fear of the noise. Whatever the issue is, whatever fear they indicate is a problem I would tap on that issue. I do use EFT for everything else too, self esteem, improvement with academics, etc. I have to say that a high percentage of these situations go back to a connection with fear. Dealing with anger and being sad are other emotions I hear about and address by using EFT.
If you have any questions please let me know. I know of various web sites if you would like additional information. I hope this is helpful.
Maureen