My first comment is that you had a low risk exposure that really did not warrant the treatments you received. Oral sex is safe sex -- not completely free of HIV/STD risk, but far lower risk than unprotected vaginal or anal sex. However, the penicillin plus doxycycline would have eradicated most conceivable bacterial infections from that event, including syphilis. Some gonorrhea would be resistant, but absence of painful urination and penile discharge are, by themselves, strong evidence against gonorrhea. So there is little likelihood you could have exposed your partner to any bacterial STD. The penile itching etc indeed sounds like anxiety -- no STD causes such symptoms. (And whenever someone suspects his or her own symptoms have a psychological origin, usually that is exactly the case.)

It's hard to interpret what is meant by "found bacteria in urine". Urinary tract infections are rare in males, and are not acquired by oral sex. And if that was a dipstick test in a standard urinalysis, it was a meaningless result anyway. I cannot imagine why any physician would prescribe azihromycin in that circumstance.

In response to your closing quesiton, syphilis is impossible:  had you been exposed, the penicillin shot was 100% reliable in aborting the infetion before it became active and before it could be transmitted. 

All is well here -- no worries for your health or your partner's.

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD

I appreciate your very detailed response and reassurance of my concerns. My apologies for the deletion of the last question! I'll keep this one posted. 

The lab reached out and let me know that the Dr. misdiagnosed me with a UTI and that everything that was found in my sample was normal. The chlamydia and gonorrhea exams came back as negative as well as of Sept 10th. 

Once again, thank you for sharing your knowledge and for operating this website. 

Thanks for your kind words. I'm glad to have helped. Best wishes and stay safe.