Second failed TWOC after TURP is really getting me down

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Hello all. I was diagnosed with PC in June 2025 and after a few bouts of prostatitis that was delaying my radiotherapy it was decided to do a TURP as it was felt my poor urine output was causing issues. I had the TURP which was "unremarkable" and came out of hospital without a catheter.  I had to go back in and have one because I was in retention. 

So far I have had a couple of TWOCs and both failed because I was constipated and couldn't fill my bladder to pass urine. Constipation has been an issue for me in the past I have MS and the doctor has previously said it's slow transit constipation. 

I've upped my fibre and following a GP visit am taking Fybogel daily (twice) and drinking about 3 litres of liquid.  I still have terrible difficulty with constipation. I've been told by urology that they won't do the planned urodynamics if I'm still constipated. And it's holding up my radiotherapy. 

Has anyone had similar experience and can share anything you did?  I'm terribly stressed and worried about this daily battle and of course this doesn't help at all. I feel in a real hole with it. 

Thank you for any thoughts you might have. 

Phil