My wife is a urology cancer nurse and was quite concerned when my flow changed about a year ago.
I had a raised PSA 3.9 followed up 3 months later at 2.9 so although raised no further action for now (50 yes old).
My dad had prostate cancer (removed prostate) so am going to try to get PSA checked again in a year.
For those with PSAs that bounce about a bit, she says that riding a bike can raise your PSA and she insisted on me not riding two weeks prior to the test to ensure it was as accurate as it can be.
One thing that has radically changed my toilet visits is taking Tamsulosin, it is for benign enlarged prostates and has allowed me to piss like a 10 year old again!