I hope you are still seeing and in contact with your radiolgist/oncologist. This would be something I think you should asked them or your urologist.

Now on a personal level I have had this also happen. I finished my proton radiation less that 4 weeks ago. I had this same unusually happen to me just today. I found if I drink cold drinks and drink hot coffee this happens to me. For some reason this stopped happening after a couple of hours.

I differ from you as my change in urination is throughout the day and night. Sometimes 2-3 hours sometimes 1-2 hours. I think not only prostrate is highly irritated from radiation treatment there is some secondary radiation of bladder even though pencil beam proton. I was advised since prostrate can move during the radiation they do margins. So even though I did the drink water to mover bladde up and away I think you still get some radiation irritation to bladder and rectum (had Space/Oar).

My urninary functions are all over the place. I asked my radiogist/oncologist about these changes and he said it would take a couple of months to get better and that was not uncommon to happen and I was at less than a month since end of treatments.

I have access to my oncologist/radiologist via portal, phone, and have appts. if needed as well as scheduled appointments. Since we are all diferent and can react all differently I would recommend contacting your care provider to make sure it is not something that needs to be addressed medically.

During my radiation treatments I thought my urine smelled funny. I had a complete urninalysis done but was normal. I was told food and drinks can cause this.