supraventricular tachycardia
"About 4 months ago, I was finally diagnosed with Supraventricular tachycardia. At first I was diagnosed with anxiety but knew it had to be something else. Turns out that anxiety is a common symptom of SVT. I was put on Metoprolol 12.5 mg (half 25 mg tab) but had to keep increasing dosage to now 37.5mg per day. I tried taking it in the morning, but it made me feel weird and heart felt heavy. I switched to night time. It does help me sleep. I was initially tired, but that wore off. No other symptoms other than feeling more at ease and calm. I am a 46 yr old female in pretty good shape...no weight gain like others complained of."