Just a thought, but if you decide to once again go off the metoprolol, then don't put yourself in a position where you are just waiting for the next panic attack. You could be putting yourself in a kind of a loop function where you are becoming anxious which may cause your heart rate and BP to go up which causes you to have a panic attack. In the computer world it is called a "do-loop." A function or steps that keep repeating until some outside action breaks the loop. For you maybe that outside action that will break you loop maybe just giving yourself positive feedback. I am just a process-oriented person and not someone who understands your situation and I really suggest that you consult with your health care professional to see if they have suggestions to help you with the panic attacks.

Blessings to you