Hi, thanks for your reply. But I'm not even 25 yet, why would I
suddenly developed enlarged prostate? Because I read that it
happened to men above 50...
Yes, usually it happens to men above 50. Prostate glands usually
have two stage of growth (i.e. one at teenage/early adolscent
and another at older stage) as you might have researched
already. The reason why prostate gland enlarge is unknown but
generally due to hormones changes in the body.
I see that you have completed your NS and the suddenly change in
hormone levels could results in the said experience, thus my
deduction that you're more sensitive to the hormonal changes in the
body.
Afterall, I am some busy body, and my deduction should not be
taken so seriously. The doctors are right to
order tests and prescribe antibiotics as per standard medical
practice and guideline. But some times, they may tend to
overlook smaller details due to out of norm cases. 
I hope your conditions will improve and wish you good
health in dragon years 
Share with you a story.
An old lady went to the doctor for headache. Seen many doctors,
and doctor prescribed paracetamol. The problems goes away
temporarily and after a while the lady still suffer from headache.
She sees another doctor, and the doctor thoughts she might be
having an infection of the brain and thus started antibiotic. The
antibiotic didn't work and the headache still persist. The doctors
was puzzled too. She then went to see another doctor, this
time a young chap. As usual, the lady told the
doctor what happened, and the young promising doctor check her ears
and notice ear infection. Viola, the headache was caused
by ear infection. He prescribed drugs for the ear infection,
and the lady's headache was gone. 
