My bet is that your penile pain had nothing to do with the
oral sex event. Pain without discharge is not a common STD symptom in men; even when discharge
and pain are present, the pain comonent typically is trivial, only a little minor discomfort on urination.
To your specific questions:
1) What STDs from oral sex? Chlamydia zero, HIV almost zero, syphilis extremely rare, HPV zero to low.