Is anyone here gluten free or allergic to wheat or corn?

I just found out I am allergic to wheat, corn, soy, peanuts and food coloring.
I checked out a book at the library, called "Gluten Free Girl", has some recipes that look pretty good and I recommend reading it if you are gluten free. http://glutenfreegirl.com/
I am specifically wondering how GF can be CHEAPER, because I think one could go broke buying the flours and such. I am having a hard time cooking for me and then re-cooking for everyone else because I don't want to fix "my" food for the others, due to the cost. Of course most people can still have corn which is a lovely flour to use for things, but I can't have that. I do eat oats though, and I understand that gluten intolerant have to special order certified wheat free oats due to cross contamination during process (oats do not have gluten naturally)
One of the main staple flours used is white rice flour, or brown rice, and was wondering if there was a way I could buy rice and grind it myself into flour? Also does anyone have any recipes for using mashed beans as a flour replacement? This is of course not a temporary "diet" for me, it will be forever since the wheat makes me sick.
My symptoms by the way for YEARS, extreme lethargy, sleepiness to the point of sometimes sleeping for hours during the day, only forcing myself up in time to catch the school bus, falling asleep with food in my mouth, or while reading or on the computer. Drinking large amounts of tea, coffee, or taking meds to stay awake. A normal sleep study. Falling asleep driving. Aching joints, muscle pain, headaches/migraines, brain fog-feeling like my brain was asleep and cannot think or remember clearly. Constant congestion and drainage. Itching sometimes all over my back, rash, for no reason (which I thought was seasonal allergies to pollens and such) I was diagnosed at one point with fibromyalgia. All other tests always came back normal and drs could not find what was wrong. I finally went to an allergist for what I thought was seasonal allergies and he asked if I was allergic to any foods. I decided to do the food testing on a whim, and wow. I could not believe for the past 16 years what I was eating everyday was making me so sick. I also tested highly allergic to 40 other things, not foods, the only thing he tested me for that I was not allergic to was feathers. I am now on a prescription antihistamine, and a short spurt of steroids for current swelling, and weekly shots for the next several years. I also have to carry an epi-pen. Since quitting the foods and carefully watching everything I eat, I feel SO much better. I feel almost new! It's only been about 3 weeks or so, so I expect to improve even more.