Hello. I'm Dr. Phil, licensed and practicing internist. Excellent service is my goal.
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Thanks for this questin
I think you very well could have a urinary tract infection
It is difficult to diagnose in something with a suprapubic catheter given that the urine will always look infected on normal readings because bacteria live there.
I suggest an empiric trial of antibiotics. This means just starting antibiotics and see how you do.
The stinging sensation could be something else like nerve related but infections are possible in your situation
I hope this helps.
If you have more questions just reply :)