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Breathe with your eyes open or closed, whatever makes you feel calmer.
If you're seeing disturbing images with your eyes closed, find a simple, fixed object in the room or an empty wall and keep your gaze at it during your breathwork practice.
Focus and feel the belly filling up as you breathe in, suck the belly in as your breathe out.
If you're particularly restless, you can focus on the belly-in / belly-out while walking or doing simple activities like cleaning, yoga, tidying the yard, picking up flowers in a meadow for a bouquet, etc.
Take a few very deep breaths to start with, then breathe normally but deep enough to fill the stomach with air. Over time you can add another element: holding the air for a few seconds before letting it out.
As you focus on the process, don't try to hash any upcoming thoughts or emotions. Don't engage with them either, but let them breathe with you.