I could have a choice, a very important condition, when you have cancer because cancer seems to take away your choices. I could take back some form of control in my life. Now surviving is a state of mind. Despite moments, hours, and sometimes days of sadness and pain you should never loose the ability to laugh at some of the absurdity of cancer and cancer treatments. I met a women who denied treatment because she thought that she would look terrible bald.
Control here is a big issue.
He knows what he's doing and you don't have a clue what you are doing. Ask lots of questions. If your doctor doesn't know the answers there are a great many other sources. There are books on everything you never wanted to know about cancer. There are books on everything from alternative treatment to vitamins.