I think you are traumatising yourself unnecessarily. The urologist has seen you and is satisfied that you do not have prostate cancer, it sounds like his concern was to make sure that you had not damaged your kidneys. The circumstances that day that allowed you to become so dehydrated may also have pushed your PSA up temporarily; some PSA is produced by the adrenal glands and thyroid issues can also affect PSA so it is possible that as your organs responded to the lack of water, weird things happened. The fact that the PSA then dropped back to a more normal number and has pretty much stayed there is a good sign.
Heenan is right when he says PSA is not a reliable test, but it is commonly a good indicator and the general parameters that you quote are sort of right and sort of wrong. They are not guidelines for when it might be cancer, they are guidelines for GPs on when to consider referral to urology. For a man age 50, NHS guidance says refer if PSA is over 3.1 but the GP and the man have to take into consideration the individual circumstances. For example, serious cyclists are known to have a higher 'healthy' PSA than other men.
There are men like my husband who were diagnosed even though their PSA would have been considered normal or even low. I have seen men join this forum whose PSA was over 40 but diagnosed with BPH or prostatitis instead.
Re your question about doubling time, generally this is used as an indicator in men that have had cancer and been treated whose treatment may be failing. In a man that hasn't yet been diagnosed, doubling time is less significant than the fact that it is rising (which might be a good time to get referred back to the hospital)
"Life can only be understood backwards; but it must be lived forwards." Soren Kierkegaard
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