Admitted to ER for Atrial Fibrillation. Heart rate was around 170, rhythm was ragged. ER administered 4 shocks while I was under sedation. The electro-conversion didn't work, so they administered IV toprol, and sent me on my way. Heart converted to normal sinus rhythm some 30 hours later. Several days later, and I feel like I've been pulled through a keyhole backwards. Is this normal? And is it a result of the electro-conversion, sedation, toprol, or all of the above?