Constant need to urinate with radiation therapy for prostate cancer

Double urination can help. Drink lots of water in morning until urine is clear, and stop drinking water a few hours before bed. Try sitting for the second urination.

Oh, add carbonated drinks (pop, beer, etc) to the list of things that can irritate the urinary tract if you have radiation cystitis.

That was one of the worst for me — I could still manage caffeine in moderation, but I'd be facing a VERY long night if I had a can of pop or cider with dinner.

Sorry you had to go through all that but glad it's getting better. Appreciate the thoughts and prayers. Prayers for you as well.

I can sure relate to all of that. I had the same, 28 treatments of radiation, which ended a year ago.
It is just now improving, but for months during and after radiation it was endless peeing. Also, 4 UTIs
last year! The bladder and prostate can be extremely inflamed. Phenazopyridine(AZO) did help some, but
not a lot. Recently a full bladder irrigation helped tremendously! Good luck with your treatment, it will get better, but may take some time. Prayers.

No I do not. I am having 28 treatments but am unsure of the type machine used.

Very good suggestion that I hadn't thought of. I'm surprised I haven't worn a path through my carpet with all the trips.

You sound almost exactly like me. 21 sessions of proton beam therapy and urinary issues from about session 7 or so. Nurses said it was too early but all I knew was that is was very real. Received flomax which helped a little. Also had hemorrhoids which was a first for me and probably a direct result of not drinking enough water (due to painful urination). Unfortunately, the only thing that helped was time. By about session 16, the symptoms were manageable somewhat. Seems counterintuitive but stay hydrated.

Dave1957: do you know the type of radiation machine that was used on you?

One more non-medical suggestion. Because my metastasis had left me paraplegic for a while, I'd gotten used to using urinal bottles like these during my months in the hospital:
https://www.amazon.com/Urinals-Spill-Proof-PerfectMed-Pack/dp/B07YMHR8SJ/
When my dysuria started and I needed to go every 30 min sometimes at night, I found that keeping one of these beside the bed make a big difference: I didn't need to wake all the way up to use it (no walking to the bathroom, etc), and because I knew it was so close, I ended up needing it less, because I didn't feel as worried about making it (stress can cause the detrusor muscle to contract — search for "urge incontinence"). So my sleep starting improving.

You can keep hand sanitizer on the bedside table to clean your hands, and in the morning, just empty the urinal bottle into the toilet, then shake it up with some water and squirt of hand soap or shampoo to keep it clean and fresh-smelling.

Suggest looking into ‘bladder neuromodulation’. Placement of this device significantly improved my hyperactive bladder symptoms, allowing decent sleep.