Ok, background
DS is 7yrs. I've always suspected possible ASD tendencies but DH always told me it was in my head. As a baby, DS had major manic episodes after gluten and after testing at Sunderland, leaky gut was confirmed (thanks MN)
Major improvement after this but still major social issues and strange reactions to dressing up or nursery nativity. Also slight dyspraxic tendencies (can't ride a bike, poor pencil control) No speech delay and a very bright boy. Doesn't like change or going somewhere new or to parties etc.
Now in Y2 and in the last year we have had 2 private assessments (one was a guy recommended on here). Both has said yes to traits. However, the woman we saw said yes to lots of traits but not on the spectrum and the guy said yes to lots of traits and on the spectrum but not far enough along to get a diagnosis.
In fact, he contradicted her as he said there was no such thing as 'just off the spectrum'. He said if your not autistic, you're not autistic. She said we all have traits and DS just has more.
So, what the guy said was that if you imagine ASD to be a scale of 1-100, you may get a diagnosis around 10 and DS is around 5 or 6. I feel relieved that it's not all in my head but where to go from here? How can I support him socially? I looked at the Atwwood book but a lot of it isn't relevant to DS. Is there a book or anything with strategies to help very mildly affected kids?
He copes with MS school but it exceptionally anxious in the environment. How can I help him with this? I have 3 children (2 girls younger than him) and we are all exhausted from his tantrums which always happen within an hour of finishing school and are almost like a meltdown. 
Sorry if this is a bit on an essay. I'm just looking for a point in the right direction. Thank you. 