I'm a 16 year old girl with Mitochondrial Disease/dysfunction and was hoping for an answer to my peculiar case. Everyday, I constantly deal with muscle fatigue and pain along with migraines.. but now a few new symptoms arose. They include high heart rate (130 resting), anxiety (currently being treated), and a sharp pain within the left arm pit. We've visited the cardiologist (more than once) with multiple EKG, echocardiograms, and 24 hour halter monitors.. but every doctor is stumped. Now I've come here hoping for an answer. Do you think any of you will be able to help?