Diet and Nutrition

I was diagnosed a month ago with stage IV and have been through the first 4 week regime of chemo. So far, despite one bought of diarhea and some fatigue the day after treatments, I've held up pretty well, but I know I need to improve my nutrition and get my body weight up (I'm slender and don't have much to spare), which has dropped a few pounds. However, I've found the information and recommendations on diet and supplements confusing and even conflicting in some cases (example; my oncologist strongly recommended against taking strong anti-oxident supplements, but a book I just bought on cancer recommends taking them). Fortunately I found a very good organic / health food store nearby which has a wide variety of herbal supplements. Unfortunately, they're also very expensive. Before I spend a lot of $ and make any crazy menu changes that might cause other problems, does anyone have some good recommendations or sites / sources to look at that have good information that has worked for them? Given my diagnosis, I want to do everything I can to help the chemo fight this.

So far I've worked on adding fresh fruit and vegetables, eating fresh fish versus red meats, and adding protein powder to meals like breakfast cereal. I've tried some smoothies with milk, yogurt, berries and protein powder, but haven't found any combinations I really like. The only supplement I'm taking is a general multi vitamin. Some sources recommend supplements like tumeric and green tea extracts and many others I've never heard of before.