You might develop cancer very quickly or you might never develop cancer. It's a matter of statistics and chance, and also your own genetic makeup and how susceptible your family is to developing cancer in general.
Gluten free food doesn't have to be gross at all....you just have to know what brands are good (Udi's bread for example, most other breads are disgusting).
Before you were diagnosed, what did you eat? Did you ever eat eggs and bacon? Salads, steaks, chicken, fish? Potatoes or rice? Corn on the cob? Tomatoes? Corn tortillas?
All of those things are naturally gluten free....you can still eat LOTS of the things you used to eat before. You just have to be careful with processed foods....you have to learn how to read labels carefully. I tend to make our bread and biscuits from scratch (visit my blogsite below in my signature line to find the link to my recipe site), or I use wonderful mixes such as Pamela's Baking Mix (for pancakes, biscuits, etc.) and Pamela's Amazing Gluten Free Bread Mix. (NOTE TO MODERATORS: I am NOT financially or in any other way connected to Pamela's or Udi's or any other brand of gluten free food)
Here is a link that explains in detail HOW to go gluten free, what to eat, how to clean your kitchen of gluten and make it safe, etc.: glutenfreegoddess.blogspot.com/2006/01/morning-after-diagnosis-that-is.html
If you don't cook now, I advise you to learn! :) Learning how to make your own food will save you money and increase your safety margin because you'll know exactly what ingredients you used to make each dish, which is not the case in a restaurant!