By throwing up your food, it creates a lot of health problems for you. Like with your liver and such. (Maybe you already knew this) But PLEASE, PLEASE, PLEASE don't do that.
Anywho, do some exercise. Figure out what works for you. Personally, everyday, I don about 30 seconds of planking (which includes you in the push-up position only with your forearms down instead. That was probably confusing, Google it). Or maybe even try that Zumba dancing thing, that looks like fun!
Another part of this is eating healthy. Try cutting out all fats and carbohydrates and starches out of your diet. This includes foods like potatoes, pasta, breads, candy, ice cream, cake. Also, cut out sodas and any kind of substituted energy drinks from your diet as well. Instead of eating all of these, sub in fruits and veggies. Go to your local Farmers Market to find low prices and stock up on them. You can also look up cool recipes that you can use fruits and veggies in. You could probably discover a hidden talent of cooking like a pro!
Good Luck to you, and I hope this helps. Stay healthy!