As someone who suffers from anxiety and who regularly seeks therapy, I can say that the rituals that have helped me are:
- Realizing that anxiety isn't who you are, but more like a disturbance that will pass
- Eating, sleeping, exercising, and practicing mindfulness go a long way
- Knowing and dealing with the physiological reactions helps. Realizing that anxiety is a fight or flight response and is often based on fears of the future, which causes heart to race and breath to shorten. Therefore, simply forcing yourself to take large breaths and being mindful about the state of your body helps bring you back to the present and not let your mind get into "rabbit holes"
One piece of advice I have for you is to not take on the role of mental health professional in your relationship. This isn't your problem and you can quickly tire yourself out. All you have to do to support is help your wife accept her current state, and help remind her of living in the present. If her condition is severe enough, encourage her to see a psychiatrist in addition to a therapist too. It may help greatly.