You could be having a thyroid storm, or so my doctor called it.
I would probably go ahead and try the beta blocers for a while to protect your heart. I hate meds too, and only stayed on beta blockers for a month, but within a week my heart was much improved. In the meantime you can research and devise a plan before trying to come off the meds if you choose to do so. Reduce your stress. It figures you went right on in to work after being in ER most of the night. Learn to slow down. Take care. My prayers are with you.