I wonder, too, what is happening here. Any surgery can be highly stressful. Usually more so than the surgeon realizes or recognizes, and often more than the patient expects. The best course of action in the situation you describe, would be the usual best practice --- to see a good local shrink for a thorough assessment, and then a discussion of treatment options based on the findings. This is probably an uncomfortable but very treatable acute anxiety disorder, and could be helped by CBT counselling and perhaps some temporary medication