Bilateral Testicular Cancer, Had Benign Polyp. Done Radiation, Colonoscopy. Had PSA Tested. What Does It Mean?

I am age 51. 6'1'' 196 lb non smoker, 15 years ago was diag. with bilateral testicular cancer. had them removed and went through radiation. was told 99% no reoccurance. every year I get a check up and at 50 had colonoscopy, a benign palap was removed "everything else ok" I get my psa tested every year and its .002. Thoughout all of this time of exams I have noticed that my urine flow has been slowing. I am able to fully empy my bladder, I drink coffee all day long and recently have replaced afternoon coffee with water and am drinking about 32-48 ounces per day. I do usually wake up once in the night to go to the bathroom but that's it.
It seems like the flow may be slowing down just a bit more over the past few months...kind of like a kinked hose. no pain, no discolor in urine. My last psa was in Jan. and all clear then, what should I do to un kink the hose? or should I go back to my primary?