nausea and sore throat

I've had a really bad sore throat lately- late at night and early in the morning. A more recent development of nausea occured two nights ago and has continued in the nights and mornings. What could be causing this? I don't think it's morning sickness because I had my period two weeks ago and haven't had sex since then. I also don't think it's strep, because I had strep 2 months ago and don't have the major fatigue and extrememe nausea. Please help.