supraventricular tachycardia
"I always have a super high pulse and the last time I went to the doctor he prescribed me this to lower it and prevent migraines. I've been on it for almost a month now at 25mg once daily. During the day I feel tired, and have this gross heavy feeling in my chest. I also can't sleep at night anymore. I'm going back to the doctor in a few days to try to switch to something else."