im a female almost 18 yo and in very good shape im little about 5feet tall and weigh about 102lb about two days ago i started to feel badly it started out with nausea and a slight stomach ache but then yesterday i was working and i started feeling very dizzy and and very very hot and my father told me i was flushed in the face today i stayed home from school because i was still not feeling well but today i was very fatigued and fell asleep easily and when i would get up froma sitting or laying down position i was very dizzy and slightly disoriented and still nauseous with heart palpitations and have also had headaches the past three days in the temporal and occipital areas. i have not thrown up from the nausea but the feeling like i am going to is constant. also i will feel like im hungry but as soon as i eat i feel worse. if any one has any clues as to what might this be if you could kindly please reply

also my father is starting to feel the same way i am so im wondering if it is contagious
thank you very much