I was in er few days ago for very fast heart rate (125), skipped beats and difficulty breathing. Dr did ekg and chest x-ray and ct scan. I had to be giving injection of metoprolol to lower heart rate and placed on lopressor 12.5mg in evening. Since I started meds I feel drowsy as if in fog. At times I even feel like I am going to pass out. I also get flushed in the face and neck. I had an echo today and will have to wait for results. I am female 33yr, overweight (225#) but was 260# and was working out 4-7 days a week and loosing weight great with no difficulty doing workouts. Now I can't even go upstairs without feeling overworked and out of breath. I am so tired. Has anyone else been through this. I am scared with what is happening to me. This has all happened so suddenly.