The rage definitely could be a reaction to the anesthesia. Maybe you could research anesthesia side effects and see if rage is one. They could use a different drug on you if that is the case.

But more importantly you need a doctor who will listen to your concerns. I have had numerous ECT's and done fine with them all. I feel so much better. My doctor listens to me and schedules the treatments accordingly. He increased the frequency when I was not feeling better and is now decreasing the frequency. You need to find the right doctor.