The genital area is quite sensitive, so even the most brief touch can cause pain later on. Oral sex exposes you to gonorrhea, syphilis and herpes. What you are experiencing are not common symptoms of any of those infections. You said you tested negative for gonorrhea, but how long after your encounter did you test ? If you did it 3 weeks after the sexual encounter, your test for gonorrhea was accurate.
It would be interesting to test also for syphilis and herpes, as follows:
-6 weeks after the encounter, for syphilis.
-3 months after the encounter, for herpes.
Most people infected with syphilis get a positive result after 6 weeks, but it can take longer, so if you receive a negative result, it would be also good to repeat the test 3 months after the encounter.
All the best.