PSA of 12

I'm 53 and my PSA is 12, up from 7 last year. My GP was surprised,  and I've an mri scan in a couple of week's time. I don't have blood in my urine but I always dribble a bit after thinking I've finished.  I don't produce hardly any semen either.  I feel uncomfortable in my groin and ibuprofen doesn't alleviate this anymore.  Should I be worried?