Tony, I think a second opinion is very much worth your while. It doesn't do anything but good. You may well get the same recommendation, or you may not. Either way, you'll get a fresh perspective.
As for the straight nutrional cure...It doesn't exist. Certainly, diet can help you in your battle. That said, there is no evidence that suggests you forego traditional treatment in favor of changing your diet. That's dangerous territory, you've already been through a horrific ordeal, and the Doctors wouldn't recommend additional aggressive treatment if they didn't feel it was warranted.
There are a million and one quick "magic bullets" that will treat or cure cancer. Most are designed to relieve one thing; your pocket of all money that it contains. Stick with what your Doctors say,
Wayne