Old Engineer, I also needed a second/follow-up TURBT to verify that the staging of my cancer was correct (no muscle tissue was in my original biopsies). It took me close to 5 weeks to feel 'healed' from the initial TURBT. My tumor was a bit larger than yours (4.2cm x 2.2cm), so the 'raw' surface area in my bladder was about the size of a quarter. I also received a mytomycin wash with my first TURBT.
For my second/follow-up TURBT, I felt 'healed' about 2-3 weeks after the surgery (probably because there was no evidence of disease found, no mytomycin wash, and all the doctor did was take a few small samples from where the base of my tumor was to biopsy).
I just started my BCG treatments on 8/27. About 30 min before I have each treatment, I take 2 Advils. For treatment 1, I had only a few chills and some fatigue; for treatment 2, I had chills, slight burning when urinating, and some fatigue; for treatment 3, I had chills, slight burning when urinating, frequent urination, blood in urine, fatigue, and a very low-grade fever. For all three treatments, the side effects dissipated within 2-3 days. I'm not sure what to expect for treatments 4, 5, and 6 - but I'll let you know how they go:)
One thing that I think helps with the BCG treatments is to start drinking water about 90 minutes after the instillation of the BCG so that when the 2-hour mark rolls around, I am eliminating diluted BCG, which 'burns' less.