my appetite is exploding .. what the hell is happening to me?

i have this really bad appetite , i usually can spend an entire day without wanting to eat a thing and i usually don't enjoy a lot of food... about a coule of weeks ago it changed i don't know why i started to want some food ocasionally it wasn't all bad it was fine actually but about yesterday i started to grave for food evrything i smell iwant to eat sweet, sour, choclat evrything thing ... i spent the past 2 day anting and having a bite of evrything i lay my eye on without been fooly satisfied it's like there is something lost and i can't found it this never happened to me before imean never ever why????