I also had a phone support job, so I feel your pain. Nothing but 60-80 annoying calls back-to-back each day and, yes, a stupid email waiting for me every time I got back from the bathroom! It also gave me high blood pressure, panic attacks, and depression. I was also not brave enough to voluntarily leave the salary, but my performance began to suffer so much from my general misery that the company made the decision for me. Thank God.