Hello Doctor, I have had what, I thought was some kind of flu. but every morning when I wake up, I can t seem to shake the fever. its been over a week and without fail, every morning and every evening the fever comes back. not to mention I have had stomach aches and diahreah, should I be concerned? the fever always feels quite high. leaves me freezing and shaking and I will wake up covered in sweat every morning. should I be concerned?