Any ideas on whats wrong with me?Feeling light headed and tired?

Since last wednesday i've been feeling lightheaded or my head feels heavy at time when i look around (weird ,i know), and i've also been feeling really tired...I have no idea why....i am making an appointment tomorrow, but i just wanted to stop worrying..a little. if someone could give me a little idea of what it might be...i juist finished exams... and i shouldent really be stressed even though 2 years ago after exams i had panic attacks as well as anemia together. Now i feel tired all the time and i get a weird feeling in my head..i sometimes get a bit of a headache....i think it might be anemia .again but it doesent feel the same..?....anyway...besides that i thought i should eat more chocolate to give me energy..so i ate a bit it does help a bit but i still feel tired..about 2 weeks ago i suffered from a temperature that led to me to stay in bed the night and morning before my exam which was pretty bad i couldent even lift my head felt like fainting.. . i dont know if that would effect it?...any ideas?>.