brutal symptoms of ..?

hiya, i’m currently 4DPO, expecting my period again in a week. i’ve been having dull aches deep inside my pelvic/uterine region, feeling dizzy/headachey, physically EXHAUSTED, and most importantly my mood swings have been insanity. i’ve never flipped from happy to absolutely miserable & crying so frequently or quickly in my life. my whole body & head are out of whack, and these aren’t typical PMS symptoms (plus I never get PMS til 2-3 days before my period). is this ovulating symptoms ?? could it be early pregnancy ?? i’m just so tired & emotional and it’s driving me bananas