Why am i feeling tired all the time?

for the past 2 or 3 weeks ive been feeling really tired and drained, i think it was due to my college work but now i've finished college and im only feeling a little better. i dont know why but nothing really seems to amuse me that much and i often find myself daydreaming when someone talks to me, i also went through a week of anxiety and i hardly left the house because i thought that i was going to do something horrible or something was going to happen even though deep down i knew nothing was going to happen. ive also been really bored recently which might also be making me feel like this but i dont know whats wrong with me..i got a doctors appointment and know i have to wait 2 weeks which kinda sucks but i guess its better than not going to the doctors at all...does anyone know what i might be wrong with me??