I think i have some type of sickness?

like an hour or two after i eat i feel like i havent eaten all day. [but during school i ate every period so idk maybe my bodies hooked on it] like i might p out but not to bad. and i feel kinda dizzy and i get headaches. [i think the headaches might be from caffeine withdrawal though cuz i stopped drinking them] and i seem tired alot. and when i read things just like "stacy talked to hannahs mom" i have to read it abot 3 times to get it. and it seems like lately i cant rember anything. like i always ask the same question. and im starting to have problems in school with rembering how to do stuff. and i hate thinking now so if someone asks me a question i just ignore it. and i dont seem to sleep good. and i get random erflies in my stomach when im not nervous. and i get cold or hot alot randomly and no one else is. i dont know if i have something or idk. i do eat alot of sugar and i do take pre ap cles