Hi, i had a bad cold last week with stuffy nose, scratchy throat and a wet cough that lasted about 3 days. I thouht i was getting better. However, Thursday I developed a horrible headache, muscle aches (especially my calf muscles), extreme tiredness, blurry vision and i vomitied twice that day. The next day i developed diarrhea with the other symptoms. I am still experiencing a dull ache in the back of my head on one side, a scratchy throat, muscle aches, and i just feel weird. My vision is blurry off and on. What could this be and should I see a doctor?