I bet waking up was an awful moment. Did you panic or anything? I once saw a documentary called 'When Anesthesia fails' and people recounted when it happened to them, feeling everything being done to them but being unable to say anything.
I also had to have two surgeries a couple of years ago. It was around the time I realised I wanted to die but the first one I was still scared about it going wrong. Apparently everything in that first one went as they expected, raised heart rate, blood pressure and so on.
When I had the second one, (which actually turned out to be a waste of time because they said their was a cancerous polyp left behind from the first. but it wasn't there during the second one), I was about to start getting dressed and a nurse came up to me saying they just wanted to check everything again. She looked at the machines and I asked if anything was wrong. She said all through the surgery, my readings stayed stable, and none of them had ever witnessed that before. I never told her that I had secretly hoped something would go wrong so I would die this time. I'd pre-agreed to a blood transfusion but I felt I was ready to shout that I I retracted my agreement if something went wrong.