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I think the key information is the pain comes and goes. If you had metastatic prostate cancer to the bone, the pain would just keep getting worse and worse in your legs and lower back. The neck pain must have some other cause; that is usually not a prostate cancer symptom. On the other hand, cancer does not always follow the rules.
I've been through both cancers and still going strong, 10 yrs in the case of PCa and 5 yrs with BC. I don't recognise any inter-relationship such as you describe. I think you are worrying too much. Relax and act upon positive findings from your medical team, rather than imagining problems which may or may not arise.