I have been recently diagnosed with MS. I have a lesion in the posterior aspect of the left medulla, among others. The medulla, that's a scary spot, isn't it? I have a 13 yr history of irregular heartbeart, and abnormal heart rate. Over the years, I've had all the tests, and my heart has been deemed structurally sound. No one knew what the problem was, and unfortunately sometimes didn't believe me. Is this my answer?