There is a slight possibility that, following receipt of oral sex you may be experiencing non-chlamydial NGU, a syndrome, which is the result of introduction of oral bacteria into the male urethra during oral sex. The syndrome can be diagnosed by demonstration of the presence of increased numbers of white blood cells in a urine specimen, or a swab taken from the penile urethra. If this is the problem, it does not represent a risk for your partners as it cannot be transmitted to others and does not put you at risk for complications. In Some persons who experience this syndrome a seven day course of doxycycline may help to resolve the symptoms, although most typically the symptoms go away on their own. 

Not to worry too much about the symptoms you were experiencing. You have ruled out the most serious and important possible infections. EWH