Mark,
I know its hard not to be objective, I would hold off all beliefs in his diagnosis until he gets this second opinion. You still have a chance to have much time with dad. There is a possibility the next opinion is enlightening and may be just what the doctor ordered. Have faith, stay positive, put hope into this next step. The fact the previous doctor said she hoped she was wrong indicates that possibly she is. I am bothered by the fact that they told you he was metastsized then saying they are 90 per cent sure, either he is or he isn't..I would go from here, get to the specialist, example, my husband Gene, had his first turb, the urinologist said he had to have his bladder out and chemo and radiation.
Next step the Cleveland Clinic, their diagnosis, bladder removal, no chemo and no radiation. And they were right, I am trying to make your load a little lighter by seeing that you need to wait,get that 2nd opinion, it may change many things. I am sure you are panicking, we all did, but you are doing the right thing, and you are a wonderful son. Have Hope!!!!! Ginger