My first BCG treatment experience was 7 years ago and was caught early due to blood in my urine that was due to a 25 mile bike ride.
The high grade tumor was removed and yes the catheter was the worst part. I went through bcg treatments at full dose. Cystoscopy were 3 month, 6 months and then 1 year for the last 2 years. However, this April, tumor came back. Again tumor was removed, catheter was only for 1 day and still worst part. I have completed 6 initial BCG treatments and 3 maintenance treatments all at half dose due to bcg shortage. This was a blessing as my body was able to better tolerate this. I have 3 more maintenance treatments after scope in November. Praying it comes back clean.
As for BCG, everyone is going to react differently. The 1st 6 were not bad, just a little bit sore but always felt like I had to pee. The last 3 were more difficult but I can’t say enough to take AZO right after the treatments. They are a life saver but will turn your urine orange.
Good luck with your treatments.