hello i had a temperature of 103 for 12 hours despite taking fever reducing over the counter meds. i went to the er and they told me i have mono. however i dont know anyone else who is sick and heard that swine flu can cause mono which no one tested me for. they gave me tylenol 3 elixir with codiene and after having the medication for 8 hours my fever is still 102.5 what does this mean?