Hello - I am so sorry for your difficulties. Here was our experience - My husband suffered a severe reaction/infection to BCG in December 2024 called BCG Induced Cystitis. It started out as spasms, urgency and frequency that continued to worsen. The urologist did the same thing and prescribed him oxybutynin which did absolutely nothing. And then tried to give him a myriad of other prescriptions that were useless as well. He has spent the last year undergoing treatment for that infection and has finally been cleared as of 2 weeks ago. When symptoms from BCG treatments become too severe it can be a BCG hypersensitivity which is an immune overreaction to the BCG. Some of the reactions are mild and others are severe. Please research BCG hypersensitivity and BCG induced cystitis. My husband also did a video about his experience if you'd like to see it - here is the link https://youtu.be/vVkbWDFFiTc