I agree, see a urologist. Preferable one recommended by Sheryl on The Health Forum.
I think an experienced urologist can do all the blood and urine tests, then check with his finger any irregularities with the prostrate.
With me the urologist said the problem with the prostrate is usually 1 of 3 things.
For me it was a burning sensation that did not show up as an infection on any tests but from the urologists experience he thought low grade infection that is difficult to treat, so antibiotics for a month to start with then a flow test.