Don't Understand What's Going On

So The End Of My Last Period Was On The 29th, But The Last Few Days Ive Been Throwing Up My Boobs Are Beyond Sore (Very Painful) My Feet And Back Hurt, And I've Been Getting Dizzy A Lot And I Haven't been Hungry Because I Either Threw Up Or Still Felt Nauseous My Periods Have Been So Confusing To Tell Because They Are Every 28 Days Every Time Their Was 1 Month That It Was 5 Days Late And That Wasn't The First Time Being Late Other Times It Was 1-2 Days Late..But Got Negative Test...? Anyone Else Have Ideas What's Going On?