So sorry to hear of your pain and discomfort. But you DO have some options. First, it is possible to significantly reduce the dose of BCG used. It has been shown that as little as 10% of the initial dose can be effective. (In fact, there is no "scientific" reason for the initial doses..that is just how the stuff was packaged!) By the time I finished my maintenance doses I was down to 1/3. You may want to ask your doctor about this.
Also, you have received quite a number of the doses recommended. If it really is such a problem that you do not feel that you can continue at all, you probably have received a lot of the hoped-for effects of the BCG. It is YOUR call as to whether you continue treatment.
Hope things get better for you.
Sara Anne