Back in late August I was enjoying a week-long stay in Tulum when I had a familiar feeling. A heart palpitation. I hadn't had one in a while... I'd been managing the symptoms of hyperthyroidism with medication. But with that extra thu-THUNK of a heart beat I knew it was time for another check up with my endocrinologist. I have Grave's Disease which is an autoimmune disease that causes hyperthyroidism. My thyroid is overactive. My symptoms are textbook - heart palpitations, he