Hi Julian,
It's not a nice place to be, waiting for tests and results.
My PSA test was just part of routine bloodwork so the fact that it was slightly raised (3.9) was a surprise.
The second one was up to 4.8 a few weeks later so MRI was advised. That's where you are now. The scan was easy, just a bit long as they took the series of images they needed. They injected dye into my arm and you might feel the sensation of cold as it goes in but nothing more.
I didn't get any results, just a call to say they wanted to do a biopsy. But don't let's jump ahead, your MRI might come back clear.
Just take things one test at a time, don't overload yourself with information.
The aches and pains and other symptoms are likely to be completely unconnected, I had an itchy sore scalp and was concerned it might be connected (everything must be right?)
I changed my shampoo and bought some scalp oil and it's fine now.
Try not to worry until there is something to worry about. I'm usually pretty nervous about health issues but with this I'm strangely calm. My wife is more worried than I am and I have to support her more which is a first lol.
Take care and keep in touch with your progress, as with many things just talking about it can help relieve pressure.
Mick