HELP!!!!

Hi, every one:

Since I start ha school again, I stop my fitness routine so instead of being an sporty person, I´m a couch potato. Besides all that  I never have time to cook so all the time I have to buy food, and have to be fast because I don`t have much time to eat.
All this has affected my pocket, my image and more than that I'm starting to gain weight!!!!
What can I do??? I'm a total mess.
Any advice...please!!!!

Thank you everyone. :D