I too took metropolol for a very short time. It lowered my heartbeat too low and made my heart go out of rhythm. I had to go to the er. Doc there said to stop taking it.
Medication Warning
I can validate the warning about Metoprolol. I was on it 25mg 1xdaily for less than two months. I had multiple side effects also. Coughing, panic attacks, visual hallucinations, depression, crying spells, and more. Thought I was going crazy as well. This is a dangerous drug. Beware!