Definitely get tested. I know how you feel-I had a summer of drunken mistakes and I finally went to get tested, almost cried in the waiting room because I was so nervous, and everything turned out negative.
Ironically, immediately after this, I fell head over heels for this guy (while sober) and within 3 weeks contracted chlamydia. I was devastated, cried for days, wondered why this kind of thing happened while SOBER, which drove me to drink again. We broke up a year later (due to my drinking). Also, my current bf gave me scabies (not sure if that counts as an STD). This was also while sober. Sorry if this is TMI!!!
I guess I just wanted you to know if you do have something, you're not alone.