help plz!

okay so for the past 3 days I've been feeling weak and hungry nothing would help I'd eat tooooons of food and within seconds, I could feel the food just disappear like it felt I didn't even eat. I just drank maybe 4 full glasses of water and my mouth still feels dry. And it feels like I didn't even drink anything. I'm not tired anymore I have to force myself to sleep, I have headaches that come and go, I honestly can't tell if I feel sick to my stomach or I'm hungry.