Last month, March 8th I received and gave unprotected oral to another guy and also performed unprotected frottage with him. His bare penis rubbed against my anus for a bit but there was absolutely no penetration. A few weeks later, I received and gave unprotected oral and rubbed my own penis in between his buttocks, again with no penetration. I have never had unprotected intercourse, either giving or receiving.
Just last week, I while getting ready for work, I noticed a dull ache in my scrotum, nothing too painful. The pain would come and go the next few days. Over the weekend, the ache returned so I felt around my scrotum and located a small, marble sized object to the left of my left testicle. It can be manipulated and aches when squeezed.
I went to a walk-in clinic yesterday and was administered a culture to test for STDs. The doctor also took my temp which was 99.2. He said the results would be in by the end of the week.
I have had no other symptoms, no discharge, no painful urination, no sore throat, yet I am very concerned I may somehow have gotten gonorrhea or another STD of some type. Based off the above, what is the likelihood of that occurring? Everything I've read online leads me to believe it is Epididymitis, which often occurs as a result of an STD. I truly hope this isn't the case.