I started in a very similar way to you describe. My prostate was enlarged and the DRE revealed a hard ridge. My PSA came back as 54.7 and I had an MRI and biopsy which confirmed for me it was PCa. That does not necessarily mean it will be the same for you but, I had your "what will be will be" attitude and still have.
It is a difficult time waiting for the answers but in the meantime control the things you can.
As for advice, yes listen to what the hospital say but use this site to do lots of research and look at the many many journeys. Some can be a little scary but then there are so many positive stories on here. Whatever the outcomes remember, there are such a range of treatments out there and you need to consider all of your options very carefully. For your info, I was given Hormone treatment and opted for early Chemo as mine had spread to the lymph nodes in the pelvic area. Take a look at my profile. Hope you get your answers speedily.
Stay positive and look after yourself.