Addicted to extreme flavors

Last Sunday I was participating in a half marathon running competition. After that my diet got absolutely out of control. I average probably about 5000 kcal per day and eat all the trash fastfood there is in crazy quantities. First time was a treat but I feel like i crave this trash every day now. I need extremely fatty, salty and sweet foods. I hate this. Anyone else knows what I'm taking about? Anybody got rid of this behavior?

Also zero calory sweeteners seem to be very bad since the body reacts as if sugar is incomming i.e. cravings are getting bigger.