Hi! I am freezing with chill bumps and I have my thermostat set on 80 degrees. I was wearing a sweat shirt all day Sunday even when I was outside during the middle of the day. What is wrong with me? I am 34 year old female five feet seven inches tall and 160 pounds. I have noticed lately that I will get cold and chills all of a sudden and then extremely fatigued and I will have a low grade fever, but Sunday and today I have been cold and fatigued most of the day. What could be causing this?