Is it possible that I have mono?

I don't think I've ever had mono before, but last Friday I swimming at my high school swim meet and developed a really sore throat, and I started to lose my voice. I thought I was just getting a cold, and after my race I was so exhausted that all I could do was sit. Then the next day I had a small fever and could barely talk. Then the next day I could still barely talk but felt better. My voice came back gradually throughout the week but then I got a really gross phlegm cough and I have a super runny nose, and I seem to always be tired. Whenever I lay down to watch TV, I fall asleep. I went to the movies today with my friends and constantly had to blow my nose and had trouble staying awake during the movie. Could this possibly be mono? And if so, how do I treat it?