You seem to have irregular periods
.when did you start menstuating?it takes about one year to set normally after you start gettingthe periods.
In undernurished & anaemic conditions the menses tend to be irregular.
So Lad-it's not your starving for a couple of days ,but a total effect of noneating is the problem. IF you want to be a healthy woman,you have to eat properly now.
don't you have good appetite? please get yourself throughly investigated (hb% Tlc
,mx test ,urine &stools R & M testing)to know the basic cause. & with consultation of expert doctor you will definately recover.