Worried about my son

all good advice and all good possibilities for reasons behind his actions.... but there may be a REAL LIVE medical reason for his behavior that is not obvious to anyone that isnt a Doctor....THAT is way too long without food, supplements are good BUT NOT replacements for food ...GET HIM INTO SEE A PEDIATRICIAN ASAP or take him to the ER ASAP....no food for a day is no biggy....no food for 6 days is A HUGE PROBLEM for a child...HE NEEDS PROFESSIONAL ASSISTANCE NOW....NOW!!