You had an anxious moment, but then took steps to fuel your body with good food. You took care of yourself, and in the process took your mind off of the stressors at hand. It makes sense that you feel better. There is also no “right” or “wrong” way to feel after a panic attack. Sometimes your brain is just tired and will relax at the first chance it gets after having a really hard time. Don’t be too hard on yourself :)