Well done. Welcome home. Are you in public school or private? If in public, please put in writing that you are concerned that he may have a disability and formally request he be tested - that worked in my state anyway. 6 is old enough to be tested, but if the school does it then they may believe it. If the school won't test, the cheapest way into it is the regional talent searches. Alternatives are homeschooling or afterschooling. Will your son sit down with you and show you what he can do with a Math book or website?
"All day long refusal in every subject" is bad, very bad. Are you in a position where you can just show up at school and calmly refuse to leave until you speak to the principle? I bring a book and box of kleenex.
If money is avalible for testing post to see where you should go - if your son can do school work 2 or 3 grades above his agemates, he may well be highly gifted, which takes experienced testers to properly access.
I am so sorry for your situation...
