Would you consider a urosheath!?
Have you got a “toilet card” from Mcmillan that can help you access the loo quickly in public?
Unfortunately the side effects of radiotherapy dont often get better :0(
GP may be able to prescribe you something to settle the bladder, an anticholonergic.
Wise to check that your bladder is emptying each time!
You could also avoid caffiene which irritates the bladder! Tea, coffee, fizzy juice.
Try waiting after you pee and “double void”.
Lastly- a urine sample wouldnt go amiss incase you have a uti xxx