Hi I Have Had A Sore Throat That Has Stayed

Hi I have had a sore throat that has stayed the same for two days. I felt very tired and had to leave work early two days ago and I had a mild sore throat then. After plenty of rest the fatigue is gone for the most part. Also as a side note I was sensitive to hot and cold. I would be outside in the warmth and feel tired and relaxed. When I got into work and it was cold I felt chills. What do you think this is?