So sorry to hear of your diagnosis. It is relatively uncommon (I understand that about 2% of bladder cancers are of this type.)
Where are you being treated? In the case of a rare type it is often a good idea to be seen at a major center, at least for a second opinion, to be sure that you are getting the best treatment possible. Both Johns Hopkins in Baltimore and M.D. Anderson in Texas have experience in micropapillary cancer. It does appear that bladder removal is indicated.
Here is a good summary of current information on this
bradyurology.blogspot.com/2014/03/micropapillary-bladder-cancer-i-have-it.html
Best wishes to you.
Sara Anne