it could probably work as well to close your eyes instead of staring at a wall.
i've always found meditation types revolving around focusing on one thing (candle, wall etc), or nothing (empty mind) to be really hard. my mind just wanders and i end up super anxious, frustrated, and exhausted - resulting in me giving up pretty quickly
What I've found is that focusing on "everything" - ie sitting still and trying to observe your surroundings, your body, all sounds simultaneously seems to work much better. It's easier to get to a calm state this way.
Also, doing this while walking can also work - but perhaps easier to accidentally start thinking about something else
There will always be anxiety, otherwise you would have processed it already and not hurried away into other activities. It sure feels life-threatening, but as long as you don’t give in to the illusion and remind yourself that it is not, there is no rational reason to jump away. Breathing is a typical way to remind yourself that you are safe in the present environment. And the gift you receive is more and more clarity and a relaxed base state from which to face what’s next.