I had my 12th treatment of BCG last October. I immediately had severe pain and trouble with frequent urination. Six months later and a two week dose of Isoniazid I still have pain although is is much less severe. According to my Urologist I contracted BCG cystitis. I am told that only about 8% of patients that undergo BCG treatments develop this. Has anyone else gone through this and can you give me a bit of insight as to how long I may have to endure this. Thanks...