Donald,
If you have muscle invasive bladder cancer you only have two options one is to have it removed the second is to go through raditation/chemo.
It is possible that they got it all 2.5 months ago the problem is invasive bladder cancer has a very high rate of recurrence and also has the abilty to get outside the bladder and into other organs this is why they want to take an aggressive approach. I am not that familiar with small cell carcinoma as mine was high grade TCC a much more common variety.Do you have a copy of your path report? and what does it say? You might want to get a second opinion it never hurts. I am a big advocate of bladder removal as it lets them get in there and do pathology on other organs that surround the bladder and gives a better picture of whats really going on.
Tim