Hi and thanks for using this panel for your health concerns. Oral sex involves touching. This in itself can cause some swelling and inflammation that can cause you to feel pains in your testes and the scrotum. These symptoms may result from this simple fact. The worries you have about STDs are due to the fear of contracting because you were involved in unprotected sex. Always try to get protection during sex. These symptoms are very non specific and could be caused by many other things like i just explained. It is no surprise that they are in no way related to an STD. For now, you have been cleared of STDs. You can only stay so if you adopt safe sex practices. Some simple pain killers would have been of great help. Hope this helps. Wish you a good health and feel free to come back to us.