Should i see a doctor about my eating problem or is there something that will help?

this all started in middle school i didn't have time to eat so i got food from the vending machine (usually pop-tarts but other snacks too) and i wouldn't eat the rest of the day i think it may have to do with my obsession with video games (once im off one im on another) and my family life is very depressing now that im in high school ive gotten a better chance to eat but ill feel hungry but when i walk into the lunchroom and smell food my stomach shuts off and tells me i don't wanna eat (when i try eating it doesn't taste good and i don't enjoy it i feel as if im forcing / shoving it down) ive gone full days without eating and most of the time i eat late at night midnight snacks (when im playing video-games). now im in summer and my stomach tells me to throw up when i eat food (i eat light foods now cant eat complicated stuff) so what im trying to say is that i cant sense that im hungry and when i feel the hungry pain it saying don't eat cuz food is the problem but i know i need food (i feel like i have a sailor's stomach starved for so long that i cant get used to eating again) does anyone know what i can do?