Hello,
You need to be seen by a physician to help determine the cause of your symptoms. Wtith respect to possible STD's you describe systemic symptoms and so typical STD's need to be considered (eg, gonorrhea, chlamydia, Herpes), but also HIV and Hepatitis B and C. Get seen. The sooner the better.
Best regards,
Dr. Downing
You must get to a doctor and see what this is! Maybe a clinic, if you want to be discreet. I understand you probably wish this had never happened and just want it to go away...but if no one has suggestions on the forum, please go to a Dr. !!
Good luck -