Spudnick

I am very sorry to read about your Fibromalgia, and the resulting urinary problems

I had a UTI for about 30 years, often being treated with antibiotics, before eventually I had an ultrasound which showed that I was retaining about 250 Ml.

For 6 months, I now cath myself every night and it is clearing up.

I quite understand your aversion to having something inserted in your penis.  It wasn't nice at all for the first month, but now, provided that I don't rush it, I hardly feel it, so may I suggest talking to someone about getting yourself fitted up with a cath and bag every 3 months, under anesthetic.