I do not have the same kind of cancer as your husband, so I can't answer your questions about treatments or what kind. But with your question re is this bladder cancer... the biopsy of the lung nodules should have been able to tell you what kind of cancer it was... either a metastasis of bladder cancer to the lung, or a brand new primary lung cancer. Yes, it is possible to have more than one primary cancer. But if it is two different cancers, then they would be treated differently with different kinds of chemo. If it is a spread (metastasis) of the bladder cancer to the lung, then it is still considered bladder cancer and is treated with the same treatments as the bladder cancer. So it all depends on the result from the biopsy of the lung nodules as to what kind of cancer it is.
It is not at all unusual to be going through different chemos. If a chemo doesn't work and the tumors don't shrink, then the oncologists don't want to put a patient through the side affects of a chemo if it is not doing any good. The idea is to find a chemo that will work and preferably have few to no side affects.
Not sure if this helped but thought I'd put my .02 cents in ;)
Cheryl from Vancouver