Since 2/18/17, I have experienced a low grade fever, chills, body aches, body shaking from being cold. My nose is runny and my throat is red with some white, mucus-looking stuff on the sides. My lower back in the kidney area hurts when I take deep breaths and my chest feels heavy. Stiff neck feeling. Is this possibly Influenza? I have just started to have colored sputum as of this morning.