I have extreme frequent urination especially at night, but the urination itself seems regular..no weakness to start, no weak stream, no pain, just extreme frequency especially at night. could this possibly be elevated psa or prostate cancer or bph?

If the volume seems normal ( 200 cc or more) each time you void and you just have frequency, nothing else, then the condition is called nocturia which can be a hallmark of chronic kidney disease. I would assume you do not drink fluid at night when waking up.

To answer this you need a urinalysis, PSA test and need to see a Urologist. Don't speculate He/she will examine and treat you