I have had unprotected sex with a guy. it was my first sex . and right the next day at night i started feeling sore throat, and my tongue was covered with white blister, and the day after i felt so weak, loss of appetite, nausea, etc. i took some antibiotics but since that day i have low fever like 99-101 F for 9 days. please help me, what kind of std can it be? i am very worried. what tests should i give?