Is this OCD? please help!?

you know wen your hungry, and you get that feeling in the pit of your stomach. well, this is different. i feel as if i need food in my mouth. not in my stomach, in my mouth. its such a wierd feeling, and now, since im in school, it has changed so at 3:00, wen i get home, i immediatly feel as if i need food in my mouth. if i even go near the kitchen i eat. its like my concious is screaming no!! but my bad side isnt even responding, it just makes my body eat. i began to cope with this by drinking water bottles, so i would have something in my mouth, and ciuldnt phsicaly fit food in there. i would just leave it ther, and chug. i would drink at least 3 water bottles a day, and i still do. please, help!!