odds are this isn't a std going on. usually it's something viral or as spentshells mentioned, strep throat going on. Many infections are easily transmitted through kissing someone or even just breathing within 3 feet of them and it's far more likely it's a non-std related cause of your symptoms.
go to be seen today or tomorrow and get your throat swabbed for infections and go from there.
grace
It is always best to be completely honest with your doctor. It never hurts to cover all your bases! As far as your throat goes, to me it sounds like the start of strep. While usually accompanied by swollan nodes and a fever, when I had strep I had neither, but the white spots and painful swallowing were there. Just an idea.
Like I said, be honest with your doctor, otherwise he/she isn't working with all possible information. I truely hope all goes well when you visit!! Good luck