Urination problems after HIFU

I had a HIFU 15 month ago. My PSA after treatment was 0.05, no side effects and felt great. Last two weeks I have problem with urination. First it was slower flow ending to a total shut down, so I ended in the Emergency room and got catheter installed. They removed catheter after three days, but it did not work and I have catheter reinstalled. Tomorrow I am seeing my urologist, do not know what he will say or do. Has anybody ever had similar problem. They told me that it is common occurrence after HIFU