My body has been acting really weird?

For the past few days my body has been acting weird, about two days ago my tongue was yellow. And I really don't know what causes that. Also, i haven't been eating much for the past couple of days, i'm hungry but I don't want to eat. All i've eaten this past week is like some soup, some toast, and um a cookie. I've also been shaking a lot, more than usual, and my hands get kinda splotchy too. I don't know what's going on, any ideas?