im always so sad & deprissed...i dont laugh at all or even smile...even if i got so nice gift,huge or listen to funny joke...i dont smile. However, today i was just laughing like crazy in the class becouse a silly reason or even no reason..i lost it..i los my mind...i even have my voice changed...like im another person....it did happened couple of times before...i donno what to do...somebody till me whats wrong with me??whats happening??how can i countrol it??please help ??