I've had a PSA up to 17 (it's 8.6 at the moment) and have had MRI and biopsy with nothing found so a high number isn't a death sentance. Regarding the biopsy it really is nothing to worry about. I had the local up the rectum and as already mentioned by a previous poster, it is just like having a rubber band thwacked against your skin. They do ask you to pass urine before you go home to see if everything works but I was home mowing the lawn an hour after having it done.
The finger up the rear reminds me of the old joke about the guy who goes for a rectal examination.
'Where shall I put my underpants doctor?'
'Just pop them over there next to mine.'