Hello,
It is nice to know that tests for chlamydia and gonorrhea show negative reports. Presently after having unprotected sex with a casual partner you are continuing to have sharp pain in the inside of your penis. You also have pain and feel tightness when you pee. You are suggested to have
urinalysis (R/E and C/S) and stool test done. Get clinically examined by a
urologist to detect UTI, cystitis, urinary stones,
lymphogranuloma venereum (LGV),
prostatitis, penile blood clot, hernia or
penile cancer.
You can take NSAIDS, Naproxen or Combiflam, one SOS when needed to get relieve from discomfort and pain. Your treatment (with antibiotics, antivirals, biopsy, surgery) will depend on the pathology detected and severity of your clinical symptoms. Avoid sexual activity until the pain is gone to reduce your chance of injury and to avoid infecting your girlfriend. Avoid sexual activity with multiple partners. Always perform protected sex. Get treated at the earliest.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K., General & Family Physician