Hi, thanks for taking the time. I went Costa Rica one week and I came back a week ago. Last friday evening, I started to have chills and headaches, and a little fever 38,5 celcius. I don t think it s the flu since I have no sore throat, coughing, running nose, etc. I slept a lot during the weekend. I m a little bit better, but not fully recovered. What bothers me the most is that I have recurrent chills in my back even though I don t have fever anymore. Is it ok for me to just relax and let it pass or should I see a doctor. Could it be something that I ve caught while been on vacation. Thank you very much!