About a year ago I had a microdiscectomy performed at L5-S1. Shortly after I was awakened I could not stop shivering/shaking. It was getting worse, so I asked the nurse who was standing next to me to please get me something for it. She piled blankets all over me to try and warm me up, but it was not doing the trick. I did not feel 'cold' but the shivering would not stop. I thought maybe my body was in shock because of the surgery, but for some reason I think there might have been a different explanation. Eventually she medicated me through the IV (as far as I can remember) and the shaking immediately ceased. One other thing that I found odd, is that I can remember having my endotracheal tube pulled out. Given, I was out of it, but still can remember it quite clearly.
Anyways, what are the most likely reasons for my uncontrollable shaking post anesthesia? Was it really just shock? Is this common?