How common are post-surgery problems?

I've been battling one physical trouble after another since my surgery, and wondering how common it is?? GERD and esophagitis, chronic hives, intracranial hemorrhage (caused by my slipping on ice and falling onto my head). On my 2nd day after returning to work, 5 days after the concussion, I suffered a back injury at work which sent me to the hospital for 4 days. 3 weeks later, I am finally returning to work-restricted duty. These troubles are all separate, I know. But it's totally unbelievable. Do I just have really bad luck? Do doctors at Mayo wish that they never even took my case, since so much crap has happened in 4 months? I feel like I'm a total pain in the a$$! My poor hubby, who has been there throughout everything, is now developing an anxiety disorder...no doubt due to me and all of my troubles following. One friend has also struggled since her surgery, a year ago. Her troubles are different though. I just wonder if she and I are in the minority, and doctors regret the surgeries. Or, if we are within majority, and I just don't hear much about other people's struggles. Heather