This discussion has really helped me! Now I am going to explore the linkages between heart rate problems, orthostatic intolerance, hormones, and ovarian cysts. We we will definitely circle back to a knowledgeable cardiologist. My daughter had an escalation and acute event in Sept. 2016 that my husband and I felt presented like a stroke. She had a whole host of symptoms including dizziness and balance and she didn't talk for 3 days. It was preceded by several months of migraines. She had a non contrast MRI and they ruled out stoke. When she continued to have a lot of cognitive problems a few months later we got a contrast MRI that was normal. We have been seeing a bunch of specialists with no success in diagnosing the root cause of her many, many symptoms. I really appreciate all the information you provided.