Hi, I wondered where in the world you are. It would be standard in the UK to have your prostate felt by the GP, have a psa test and if suspicious to have an MRI scan and a biopsy.
PSA can rise for a few reasons and it might be benign such as inflammation or enlargement. If the doctor felt your prostate by feeling inside your anus he would get an indication of whether it was large, hard or had protrusions. That would be one indication.
Have you lost weight due to diet or exercise. Weight loss isn't a common symptom of prostate cancer and could be something else. 6kg is quite a lot of weight to lose.