Hi Andy,
Sorry you find yourself on here with us, but it is a useful place to be. You will get lots of advice and support on here. Firstly, I know it sounds a lot easier than it is, but try not to worry too much during the wait. The biopsy results may come back negative yet. At PIRADS 4 (same as I was), it is unfortunately likely that you have got some degree of Prostate Cancer, but without the results there is no way of knowing the actual situation. I had to wait 8 weeks for my results, so I know it is hard, but try and keep yourself busy, do some nice things, and try not to dwell on it.
Secondly, IF you are confirmed as having cancer, please believe me when I say that it is normally very treatable, often curable, and not as scary as it might seem now, once you know exactly what you are dealing with and have a treatment plan in place.
Keep coming on this forum, and asking any questions you might have, and talking to us. We're reasonably well qualified to advise you mate, as most of us are in the same boat 👍
Ian.