hi, so I've had a mild fever, no voice, i get really dizzy when i stand, i cough to the point where i gag, and i ache all over(i feel like I've been hit by a bus), and i can't control when i cough. My coughing sounds like theres mucus in my throat, but i don't cough anything up. I also have a really bad headache (i rarely get headaches). Is it just the flu? or is it something different?