When I feel my anxiety gets too much space in my brain these are some things that work for me:
- Sim racing with my Moza setup
- Trail running
- Mountainbike riding on not too easy terrain
All these activities does the same thing, forces my brain to focus here and now and take time-critical micro-decisions.
Other activities that puts me in the same frame of mind would probably work too. For example climbing worked for me when I did that, and even working through a large set of pretty easy maths exercises worked while I was more focused on maths in my life.
In between the most focused parts of these activities I often gain deeper insights and feel grounded.
Good luck finding what works for you!