I had the same thing, Cityxx, they had me skip a week because I was so inflammed. The spasms are horrible, constant need to pee as you said, it does get better. I still have some spasms, and still urinate frequently, but not like while going through the treatments. I am having a cystcoscopy on Mon., and pending the results, will have to start another round of maintenance. I may have to have another surgery if the tumors have returned, and start all over again. I never had the fever and chills, but must be awful, along with the spasms, etc. Hope things settle down after you complete the series. It's something that we have no choice over, except have the bladder out, and I certainly don't want that.
Just finished my 4th BCG+ Interferon. Quite significant side effects as in the last few weeks:
1) painful/burning/frequent/urgent to pee;
2) with little blood, small blood clot or tissues (cannot distinguish)
3) flu/fever symptoms.
I think I had more of the side effects than just BCG alone. Do not know whether this is a good sign?
Stil 2 more rounds to go.