im 15 and i have to take the pill cuz i would never get my period...

im 15 and i have to take the pill cuz i would never get my period for months and i was always doing pregnancy test, this is my first day on the pill nd i just feel so down and dizzy, i have no appetite at all nd before the pill my dad makes me eat cuz im already skinny bt im scared hes going to like put me in the hospital nd make me gain weight, ima see how the pill trats me for the first month. Also i just got sleepy all of a sudden and my blood pressure is going up and down like crazy!!!