If not already being monitored by the oncologist, you need to be referred back to them. Your PSA cannot be explained by anything other than you have some active prostate cancer somewhere in your body. With a PSA of 3.2, I am not sure that you need to hold out for a PSMA scan if there are delays or difficulty accessing this in your area - a choline PET scan and a bone scan may be quicker and just as effective. But certainly, see what scans the oncologist recommends.