Hi. I Am A Diabetic Who Had Septic Shock Syndrome

Hi. I am a diabetic who had septic shock syndrome with multiple organ failure and spent 10 days in a coma. Just background info. My question is regarding exercise. When I get back from the gym, I go through a phase of extreme chilliness. Sometimes I'm covered by four blankets and I'm still shivering. This only seems to happen after exercise. Any ideas or suggestions? Thanks for your time and attention.