Wile E - you should get after this problem before it gets you. It might be something minor, but you need to know that.
You mentioned night activity with your wife. A uroligist will tell you that if you can get it up now, you can probably get it up after prostate removal. If it doesn't work right now, it certainly won't be better afterwards. Talk to your uroligist - ask him about nerve sparing surgery - make your concerns known to him. I had my prostate removed last year on August 29, and on October 12 we tried it out. It worked. Mind you - it don't pop right up like it did before removal, but it works - without Viagra. And it's working better as time goes on. I hope I haven't offended anyone, but I wanted you to know your nightlife is not necessarily over. And of course I hope that he can fix you up with medicine and no surgery.
My uroligist told me that the side effects of radiation are worse than radical removal of the prostate, sexually speaking.
Also - be aware that you can have a prostate biopsy under anesthetic. I recommend the anesthetic. Some folks almost seem to enjoy a biopsy (they imply), but it was very unpleasant for me.
I hope you get good news when you visit your doctor, and I hope you don't need prostate removal.