Hi @alderton, glad to have a chance to share my experiences with you in hopes that they will relieve some of your anxieties about how to deal with urine flow problems. My personal experience is similar to yours — TURP a few years ago when I was about 75 years old and night time urination every 2 hours. Soon after the operation, my urologist started periodic cystoscopy to check my urethra and the sphincter just below my bladder. He's now scoping me out once a year, and I'm due for my 2020 appointment later this month.
One thing I'm preparing to discuss with him is my reluctant urine flow. My first "output" starts as expected, but doesn't remove enough urine, leaving a half-cup or a little more backed up in my kidneys and/or my ureter from the kidneys to the bladder. After a short walk around the house, I can finish the job. At night, this is a little inconvenient, but not enough to pressure me into more surgery or other medical interventions. I'm glad to report that the reluctant urine is not the result of a damaged or faulty sphincter, which the cystoscope passes through with only a little discomfort. I'd also emphasize that the night time inconvenience is not a big deal — I get up every 2 or 3 hours during the night, then go back to sleep without much delay.
A suprapubic catheter was my dad's problem. His TURP back in the 1980s essentially immobilized the urine flow through his bladder sphincter and in other points along his urethra. For a few months, he was able to self-catheterize through his urethra, but that caused a little internal damage from time to time, and his urologist recommended the permanent catheter connected to an external bag. That worked for him for several years at home, then his care takers at his assisted living facility helped him with it for several more years. During that time, he was able to dance with some of the ladies without feeling inferior about his special arrangement.
One last comment for now: Colleen as usual was on spot asking whether you have considered getting a second opinion. Both I and my dad had the good fortune of building a team of urologists and other medical personnel to deal with our needs. I hope you'll be able to do that as well. Let us know how we can help and what more information we can provide. Martin