Frequent and urine burning

I had been diagnosed with prostate cancer on 4th Jan. 2022with Gleason score 8 ( locally prostate cancer, stage cT2cN0M0).
Treatment was ADT Triptorelin 11.25 mg began in 17/01/2022 for 2 years with interval of 3 months in between the doses, the major side effect is very low libido and EBRT in 28 fractions from 21/01/2022 to 26/02/2022 and the major side effect up to writing of the text is frequent and burning urine otherwise no any prompted side effect.
My urologist and oncologist are aware of it but both told me to drink a lot of water. My quarterly Psa is in the range of .01 and .02.
I appreciate to receive any comment that may help me on the issue and wish to all a speed recovery and cure.