I had a L5 S1 fusion with hardware and discetctomy in September of last year. I suffer from a pilonidal cyst. Yesterday I had a general surgeon lance and pack it. I am on antibiotics. Since the cyst began infected I have been suffering from a bad fever, chills, tiredness, loss of appetite, and nauseous. I have also noticed my lumbar area is really hot and incredibly swollen. Should I be worried? What should I do ?