What Causes Voice Hoarseness,chest Tightness And Nausea?

I am a female college student in Macon, Ga. Yesterday my voice was completely horse, and today I was horse for the majority of the day. Now, my voice is about 50% back, but now my chest feels tight. I am also a little bit nauseous. My throat is not sore like strep throat, but it hurts a little. Could this just be allergies or is it some kind of sickness. Also, there is no chance that I am pregnant.