you have multiple posts on the forum now. please read our read before posting post on the forum for the guidelines of posting here.
bottom line is you need to be seen. the antibiotic dose you took was useless for treating std's and you shouldn't be guessing and self medicating when you don't have any idea what is going on.
grace
This could be a few things including an STD or not drinking enough water. Seen as you had unprotected sex I recommend going to your local sexual health clinic for a full panel of tests to rule that out. Good luck.