Ever since I got "promoted" to the ninth grade, I've had a closing feeling in my throat. It's not as bad now, but it does hurt to swallow. I've had some coughing fits, but they're not that bad. Just to get up phlegm. My mom said I might have mono. And judging by the fact that I'm not getting any better, I think I do. Now my whole freaking vacation is ruined. Does anyone know how long the symptoms last?