Angela,
Sorry to read of your situation. You are right to seek out the best nutrition you can. Nutrition is the key.
Since I started learning about nutrition, my views have changed considerably. We seem to think of foods for particular conditions, and this is not correct. We should be thinking of satisfying all the body's needs. That means eating the right foods, but equally important is avoiding the wrong foods.
You are in a weakened condition, so you also need to be gentle with you body. People seem to think that if something is good, more is better. No, adequate is better.
There are many toxins in everyday food that most of us can cope with, but just sometimes we become overloaded and disease is the result. There are many things that pass themselves off as food, which are not really nutritious at all.
Also avoiding enviromental toxins is vitally important. It might have been one of these that triggered your condition.
I would really advise you to seek out a professional, skilled in this area. My course will take me 4 years to complete in total, that is a lot of learning required. It is very cmplicated and the actions might surprise you because things you might have thought of as harmless in the past are not quite so innocent.
Anyway the following might help you:
For principles of a good healthy diet, where no-one has any vested intrest see:
http://www.westonaprice.org/brochures/wapfbrochure.htmlYou will find that a lot here runs contrary to popular belief - but it makes sense to me.
To help build your immune system you need a full range of vitamins and minerals, just recommended doses, so find a good quality all-round vitamin AND mineral supplement. The vitamins and minerals most commonly associated with immune function are:
zinc, iron, vitamin C, vitamin A, Beta carotine, vitamin B6, E, D, and essential fatty acids (EFAs).
Cod-liver-oil is a good source of omega-3 oils, A & D. E needs to be natural.
Flax seed is good, but make sure they are "cracked", otherwise they pass straight throught. They contain an omega-3 source and 200 lignans which help the body.
The most important thing to stop eating is processed vegetable oil because it has high levels of linoleic acid, trans fats, and residual toxins from processing. The same is true of margarine. All of these work against the immune system.
Dairy products typically contain residual toxins (unless organic). In most situations the levels are tolerable, but when you are recoveing they need to be avoided.
Red meat taxes the body and should be avoided during recovery.
I don't know if I'm allowed to recommend a book on this forum, but
"Shattering the cancer myth" by Katrina Ellis has a comprehensive set of approaches to adopt at any stage of the disease. She writes from personal experience.
However, I would still recommend you find a professional in this field, such as an ND, rather than trying to go it alone.
Let us know your progress as you get better. The fact that you have sought information means you have a possitive mental attitude. Keep this up at all times, it is your most important ally.
The others have all given good information, I am sure it will help.
Cheers,