I understand your anxiety but I think it might be misplaced. From what you've described you seem to be suffering from a series of either urinary infections, a chronic prostate condtion (prostititis), some other type of infection which has inflamed your prostate, or perhaps a combination of all of these.
Any of these conditions can cause your PSA to elevate (as well as sex before the blood draw, some over the counter medications, or other physical activities that could put pressure on your prostate. Your free PSA is in the so-called "normal" range.
Frankly, I see no reason to push for a biopsy. While infections from the biopsy procedure is rare, I have had two friends in the very recent past who have now ended up with sepsis following prostate biopsies which landed them in the ICU for several days each and cause long lasting ill effects.
While it's technically not impossible, it is extremely rare (almost unheard of) for a man your age to be positively diagnosed with prostate cancer that requires treatment.
Of course the choice is yours in consultation with your urologist, but I would continue on with the treatment course your doctor has you on. The small PSA rise you seem to be worried about from the February 2011 PSA can easily be accounted for given the infections that seem to be plaguing you. Chronic prostititis may require a long course of antibiotics.
Good luck to you.