I am a 28 year old woman with borderline, hypothyroidism, I take 50 mg. of Synthroid a day. I have low blood pressure 85/60, low body temp, 97.0 and a slow hart rate 58-60 beats perminute. Every day after I eat super, my heart will race to about 120 beats per minute, and I “ll have palaptations. Some days my heart will become so slow that it feels like it actually stops beating for couple of seconds. Is all this related to the hypothyroidism? Should I see an endocrinologist or a cardiologist?