hello.there is nothing like blood rubin its bilirubin
and its related to liver
and not kidneys.
you have not mentioned your age.
if your urinary frequency has increased and so is the amount you should definitely get yourself examined a evaluated to rule out common conditions like diabetes
which might also affect your sexual life unless treated.
also if age is the factor even prostate
enlargement can lead to similar symptoms.
and i would advice you to stop drinking coffee for a while till your problem comes to a diagnosis.
all the best.