Somehow I get the feeling Dr. Google has been at work here. Searched for back pain and saw it could be a symptom of PCa? Have you had any tests for PCa? Have you seen a urologist? Had a digital exam?
PSA doesn't give you prostate cancer. PSA is an indicator of prostate activity - and sometimes an indicator for prostate cancer. At 0.46 it's and 32 years of age - it's doubtful that prostate cancer is present - nothing about your PSA number indicates that, and most times - it is simply a pinched nerve or disk out of place. I've had back issues for about 45 years - starting right around your age. It was never caused by prostate cancer (although I definitely did have is, it started when I was around 73 years old (now 77..)
That's the problem with Dr. Google - many people look up a symptom and latch onto the worst possible cause of that symptom and become convinced that's the cause of their issue. I'd strongly suggest seeing a real doctor (I assume you must have one since you had CT scans). The symptoms you described could be related to a common cold or Covid infection (which can cause ALL of the symptoms you're describing..)