Welcome to our Forum.  I'll be pleased to comment.  You are correct in your assumption that receipt of masturbation, whether than involves "hand jobs" or having your anus "fingered" does not put you at risk for any STIs.  On the other hand, there is a small risk from receiving oral sex (fellatio).  I realize that you have suggested that your partner's oral contact with you penis was minimal and certainly the duration of exposure does effect what small risk there is associated with this sort of exposure but the risk is not zero, unlike receipt of masturbation.

So, what should you be worried about?.  You are correct, gonorrhea is your greatest concern.  There is also a theoretical concern that you could have gotten non-chlamydial NGU but the absence of symptoms at this time makes that most unlikely.  If you do not have HSV-1, there is also a very small risk for this as well but that risk too is quite small.  so, in answer to your questions:

I agree, abnormal sensations that come and go as you describe are not a symptom of any STI but can occur when one focuses on the genitals, looking for symptoms of infection. 

Yes, the symptoms that I was referring to were abnormal burning on urination or a penile discharge.  In the absence of symptoms, in your situation the chance that you have gonorrhea or NGU are low, certainly less than 1%.

Only positive tests are reported to the Health Department and your tests will almost certainly be negative.  further, infections reported to Health Departments are treated with strict confidentiality.  If you wish to be tested, I would not hesitate because of confidentiality concerns.  EWH