Hi,I had low dose Brachytherpy in 2016 and the first few months can be difficult and getting up many times a night is normal ,but i don't remember pain passing water.I was on Tamulosen tablets prescribed by the doctor and that helped a lot and i stopped taking them about three months later.
Maybe your specialist can help but you are still early days from treatment.I am 7 years on from Brachytherpy and have been signed off and pleased with the results and the low psa .If i can help any further please ask.
Ps i still get up twice a night but that is normal for me at 77.
John.