For the past 24 hours I ve had extreme fatigue, abdominal pain, a headache, back ache, chills and a loss of appetite. I don t have a fever at all, but if I stand up to fast or for too long I feel as though I m going to faint. I can t get comfortable because of this back pain, and earlier tonight I had shooting pains in my head so bad that they brought tears to my eyes. Overall I feel miserable, how long until I should see a doctor?