It could be a reading, watching TV, or a project your working on. Later, when you're feeling up to it, address your feelings. People with panic disorder make the mistake of trying to control their symptoms. But you can't stop a panic attack once it's started. Paradoxically, this should help it subside.
Anxious people breathe rapid, shallow breaths from their chest.
Slow, deep breathing from your stomach helps you relax. Breathe in deep until you fill your lungs, hold it inside for the count of ten, slowly exhale. Repeat this until your body relaxes. Anxiety cumulates in our bodies and needs to be discharged. Sit or lay down in a comfortable position.