For 3 Months Now, I Have Experienced Chest Cramping And

For 3 months now, I have experienced chest cramping and atrial fibrillation days before my period. I also get a bad pain in my right flank area around the same time. I have been in the hospital and had to have a cardioversion back in November and have had CAT scan and nuclear stress test in April which all come back perfectly fine. My current doctor says there is no way that this is related to my cycle, but it always happens in the same time frame with the same symptoms. I know hormones can wreak havoc on a body...any ideas?