For The Past Week And A Half I Have Had

For the past week and a half I have had a bad sore throat. At first , it was only on my left side of my throat and then it went to my right side of my throat. Right now, my throat hurts all over. I went to 2 different doctors and got tested for mono and strep. Both tests came back negative. Swallowing is painful and at times, when I swallow, my ear does hurt at times. I have been feeling a bit lightheaded at times and have had constant headaches. Within the past two days I have begun coughing. These coughs have no phlegm and do hurt my throat.