Like Lockwood said, I also recently had to switch to gluten free. It's been stupid hard (I think the worst part is when my friends invite me out to eat and I have to 'lamely' bring food because I don't want "issues" - thankfully my friends are really understanding) but it's totally survivable! Totally.
How I've been managing is I found one really good cookbook from the library initially (http://www.amazon.com/The-Gluten-Free-Baking-Book-Small-Batch/dp/0778802744/ref=sr_1_5?ie=UTF8&qid=1355181965&sr=8-5&keywords=gluten+free+cookbook+heather+butt - the batch sizes are small and delicious which is perfect for one person!) and I use it.
I've tried to always have a "Baking Day" on Sunday where I bake a loaf of bread for the coming week, plus some "sweet" thing like cupcakes, cookies, or brownies (that way I can easily throw something tasty in my bag for when that craving to eat something "bad" hits). I'll stick half the batch of sweet things in the freezer (so I don't have to "suffer" with dried out things) and stick the other half in the fridge for the first part of the week.
Then, everyday, I'll make a little sandwich with my GF bread (GF meat is not too hard to find! Just check labels) or I'll make a salad topped with some GF meat and some homemade Thousand Island dressing (GF mayo+relish+GF ketchup) and croutons made from some of that loaf I made, throw that in my bag, throw some GF fruit snacks in my bag (TreeTop makes a really tasty GF "adult" kind), a "sweet thing", a ziplock baggy of Chex (Chex are gluten free and SO tasty - Honey Nut are my all time favorite but they also have Cinnamon - which taste like Churros or Elephant Ears, Chocolate - gross, imo, and Apple Cinnamon - pretty good. I rotate through them so I don't get tired of them), and a fruit cup/applesauce cup, and if I have Kettle Chips in my house...oh boy, those go in too.
Initially it seems like SO MUCH food but by the end of the day, when you've eaten it all and are still feeling good = so worth it!
For breakfast I like to eat a container of natural yogurt and a banana - I feel like the yogurt strengthens my insides against any damage that might have occurred previously and the banana just fills me up. There are so many tasty kinds of yogurt out there and there are even kinds in flavors of things we can't really have anymore - like Apple Pie!
The other thing I like to do is make a recipe of pancakes (this recipe is super tasty: Gluten-Free Pancakes or Waffles: King Arthur Flour
), eat some and throw the rest in the freezer. Then, if I don't feel like yogurt for breakfast or I'm too busy to come up with something new and different for dinner, I throw a couple in the oven @350 for 10 minutes and voila, super fast+easy dinner. I like to eat peanut butter+jelly on my pancakes which sounds a bit weird...but it fills you up! Haha
Hopefully that was helpful I thought that maybe telling you exactly how I do it would be beneficial.
I know how hard this is. But you can do it!