Many people learned to stuff themselves to stuff their emotions, including anger. It's using food as a medication.
The more you avoid eating as a "cure" for anger, sadness, pain, etc., the better you'll be able to find other ways to cope. The other posters have some good ideas. I would add: Drink some water. Go for a walk. Write an letter expressing your feelings, and then tear up and throw away the letter. Talk with a trusted friend (not one who will spread your news all over town).
The idea is to avoid looking to outside things to "fix" our feelings. Eating, shopping, drinking, and so on are bandaids that help us avoid real issues.
You'll simmer down as time goes on--don't add chocolate to the mix.
Jay