Welcome to our Forum.   I'll be pleased to comment.  STIs are relatively uncommon follow receipt of oral sex both because most people do not have STIs and also because the efficiency of transmission were an STI present is rather low.  When STIs occur following receipt of oral sex they are most commonly either gonorrhea or non-chlamydial NGU due to the introduction of bacteria from the mouth into the urethra.  From what you describe, neither is likely to be present in you.    If gonorrhea was present there would most likely be an obvious urethral discharge and burning on urination, neither of which you have. the presentation of non-chlamydial NGU may be more subtle but your symptoms appear to have begun sooner than is the case for non-chlamydial NGU which usually occurs at -10 days after exposure.  Even more importantly, your urinalysis showed no signed of inflammation (i.e. WBCs in the urine).  Finally, frequency and urination are much more common manifestations of anxiety than of STI. 

Were I you, at this point I would not be concerned and would move forward without consideration of further testing.  I hope this perspective is helpful to you.  EWH

Sorry for the delay.  Missed your follow-up.  As I answer them however, I should point out that they are a bit redundant.  I will try to provide a little more detail. 

1.  Correct.  NGU is DEFINED by the presence of the WBCs which indicate inflammation of the urethra.  The absence of WBCs in your urine is a strong indication that you do not have NGU.  The urine test is slightly less sensitive than the results of a swab inserted into your urethra but given that the symptoms you report are not symptoms typical of NGU, there is little chance that the discomfort associated with a urethral swab would add any useful information.

2.  As I said above, your symptoms are in no way suggestive of NGU.  Urinary frequency and tingling however are common symptoms of genitally focused anxiety. 

I really think you are worrying more than is needed.  EWH