Jenny, the process iof getting all of the tests before beginning treatment is often the worst part of the process as it feels like no progress is being made, but the tests are necessary to be sure that they have all the information needed to get the treatemt right. I also know that the process feels like a roller coster ride with the ups and downs (like on a roller coster the downs seem to be the most dramatic). I know that everyone saysd to stay [positive but staying positive all of the time is not really possible, you and he jkust need to be positive more than than you are negitive. The cancer can be beat, there are lots of people here that have beat cancers of all types. Look up Ticklingh Cancer here on WhatNext as he has beat testicular cancer.
You do need to make sure that you takre care of your self in addition to talking care of him. You need to be able to express your feelings about the cancer and what is is doing to both of you. If you need it look for a support group. Make sure that you get some time for your self away from him and the cancer. I know my wife has needed her time away.
Once treatments start things should at least feel like progress is being made, though chemo is not easy it is the start of the path to a cure. You both can and will beat this. Good Luxck and let us know how it goes.