hunger, tiredness, recurrent yeast infections, light/short period???

i eat everything in sight,mainly beef when i never really did before, i try everything because i cant figure out what i want, im tired most of the day and fall asleep earlier and earlier every night, ive had 3 yeast infections since February and i thought i started my period but all it was, was a brownish spotting, so im officially a week and 2 days late... what could it be??