My experience is similar. Going on two years of BCG. My symptoms were as Sara.anne described. For about 6-10 hours after BCG I had urgency, i.e., I'd no sooner get back to bed after urination and I'd feel like I had to go again. I also had cramping of bladder (spasms) which basically is a strong sense of urgency. Its uncomfortable but I wouldn't call it painful. For me this was the most annoying symptom.
Other symptoms were mild fever and chills. I required several blankets for a couple of hours. Fatigue the next day - kind of like the day after having the flu and your fever broke. Felt tired and slept for a good portion of the day.
I found that taking Ibuprofen helped with the fever/chills. Also an over-the-counter medication called AZO was very helpful to reduce some mild pain upon urination which I experienced. I suspect that was simply a reaction to the catheter. I highly recommend getting some AZO and taking it about one hour after getting home from treatment.
You might notice some blood and/or "clumps" in urine for a while. I'm told this is normal as the medication is clearing the bladder.
Hope this helps. As Sara.anne said the discomfort is temporary while the benefits can be long-term. I was always back to full strength within 48 hours. I'm certainly hoping for a cancer-free period as long as Sara.anne's (or longer!
). Its very much worth it. I found that once the initial 6-10 hours pass I enjoyed the time to just rest, read, and watch TV. No phones, no 'honey do' list, etc. I am thankful we live in a time when such medical help is available.