I cannot speak to conscientious factors well, but I always retained a lot of urine before GCS in a way that sounds like you describe. It took a long time to go, consisting of several short bursts and then a sense there was more left when "done". Urologists confirmed I was retaining quite a bit and concluded I had BPH but that my prostate didn't seem big due to masking from my hormone treatment.
Three months after GCS I now have the best emptying of my life, albeit a bit messy (minor revision scheduled for next month) and initially still somewhat incomplete. There remains a kink in the urethra my GCS surgeon (who is a gynecologist) confirmed and it will receive surgical treatment then too. I gather that I may have had more kinks when the urethra was longer.
In the meantime, my surgeon sent me to pelvic physical therapy for two visits.The PT gave me an exercise that I do on the toilet when I feel otherwise done. This exercise empties the remaining amounts from my bladder and similarly for my bowels.
I initially went to my surgeon with GCS as my focus, but the consult included discussion of the difficulty in going and a conclusion, in my case at least, that this would be good for us to follow up with after GCS. If I had not been able or ready for GCS, I still would have still benefited from the initial consult. So I'll urge you to consider a gynecology visit, ideally with someone who does GCS or perhaps fellowed with a GCS surgeon.
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