I thought the tetanus vaccine was good for 10 full years. The one I get is and same for my kids is for 10 years. So, I'd have thought you'd been good if you had it in 2009. I know that I got it two years ago and did not feel great after it and actually got a reactive lymph node from it as a side effect. they do have side effects. If you had an infection from the nail being dirty, that also cold be why you feel poorly. Go back to your doctor if this doesn't improve. good luck