I'm not a doctor, but I'm thinking you may have a lingering infection from the biopsy. From what I've read, some of these infections can be stubborn and difficult to get rid of. As you're aware, the biopsy needle perforates the colon to get to the prostate, and even though you were taking Cipro, there's always a risk of infection associated with the process. I'm not sure prostatitis would be the issue, as much as a general infection in the area, but I'm only guessing. Hopefully, your latest urine sampe will identify the exact nature of the infection and direct the doctors to the appropriate antibiotic.
We've had some guys post here who develop infections serious enough to send them to the hospital. It's rare, but it happens.
Good luck. You're not seeing many responses here, primarily because it's Christmas Eve, I guess, but I'm sure other guys will share their thoughts shortly.
Regarding the problems reaching climax, bear in mind that the sexual process is largely mental, and your state of mind is hardly conducive to good sex right now.
Dx June 2010.
PSA rose for 3 years to 6.2
Bx shows cancer in 6 of 12 cores, all left side
Gleason 7 (3 + 4)
Bone scan, CT scan, rib x-rays negative.
Negative margins; negative seminal vesicles
5 brothers, ages 52-67 ; I'm only one with PCa
Continence after 7 weeks. ED continues.
PSA 1/3/10: <0.01; 6/12/11: <0.01