Jessie
Has he ever been exposed to a pesticide or chemical. Often repeated, low dose exposure is just as toxic as a massive exposure. Many things you wouldn't expect can cause severe symptoms, like toxic mold which, like pesticides and other chemicals can cause neurological and physical symptoms. There are thousands of people who are now Multichemical Sensitive as a result of chemical poisoning. I'd get him to a board certified medical toxicologist asap.