My Periods Are Irregular. In Nov My Period Started On

My periods are irregular. In Nov my period started on the 10th and ended the 15th. It started again on the 22nd and ended the 24th. In Dec I didn't get my period until Christmas and it was dark brown and I only spotted for a few hours. This was followed by a few days of menstrual like cramps and a low grade fever. Since then I've experienced abdominal bloating, heartburn, certain foods make me vomit, extreme fatigue, dizziness, sinus congestion and in general just feeling "off." I've taken 3 HPT and all were negative. Any ideas of what this could be?