Normally your psa wont go up and then down with pc. I am guessing you have an enlarged prostate and your prostate is very sensitive to dht.
think about this: some men go bald with a T level of 250 ng while others dont see any hair loss until their T levels are over 600. The same applies to the prostate because its all about DHT. Finasteride proves this. How ? your prostate shrinks after using finasteride for 3-6 months and finasteride significantly lowers dht and nothing else.
also, the fact that flomax works tells you your prostate is enlarged. Going on T prematurely enlarges the prostate in some people. Some men who ordinarily wouldnt go bald until 50, start losing their hair at 40 when usung T, again, same with the prostate ( in some men ). Prostate enlargement is manageable. the larger your prostate gets, the higher the Psa.
how big did your Uro say your prostate was ?