I will pm you - thank you x
I understand the problem partially. My 10 y.o. son also has an autism, often sick and could not explain what is the problem.
I never gave him any medicatino. I mean no drugs. Thus, he has many supplements.
In order to answer your question I need to know a bit more.
1. Does your son have digestive problems? If "yes" - there is a very good option for that, one of my friends had epileptical seizures and said No Gluten No Casein diet helped him a lot. My son is on this diet since 3 y.o.
2. Is his motricity normal or he have problems with it - marching, doing things "by purpose"? I mean - are you sure he does not feel pain or he feels it, but due to his motor problem could not recognise where the pain is coming from and how to deal with it? If it is the first option (what I suppose), I could send you a description of a very good therapy for him that you could do at home yourself as I do, but it would not help immediately, you'd need to work several years on re-teaching him to "recognise" his body patrs and become more confident in himself (and resist less to changes). there is also Sensory therapy I could give you links and info as well. I just made a seminar on that here in the Netherlands.
Take care!
OOOXXX