BCG isn't much fun, but it's doable, beats the alternatives, and works well for many. I've had a total of 12 treatments (6+3+3) and I start my third set of maintenance treatments in 2 weeks. It's been six months since my last set of BCG maintenance treatments, and I'm doing much better. The extra 3 months between treatments helps a lot.
I still get my treatments at full strength. The only thing I can recommend is to drink plenty of liquids after each treatment. I usually start consuming clear water about 20-30 minutes before my 2 hour hold time is up. That way, when the 2 hours are up and I can void the BCG, it's diluted and doesn't sting as it passes through my urethra. After I flush my bladder with a good 32 oz or more of clear water, I start drinking warm green Matcha tea, which seems to really soothe my bladder.
Hang in there and take care of you,
Lillian G