Many of the symptoms of anxiety arise due to the stress response disengaging the diaphragm from the process of respiration. 
https://midlmeditation.com/meditation-for-anxiety

Re-engagement of the diaphragm in autonomous breathing switches off chest hyperventilation and allows depleted C02 levels to re-balance. This results in a decrease in anxiety symptoms such as hyperventilation, tightness of chest, mental dullness, agitation and restlessness which make us defensive and affects our social interactions with others.

MIDL Mindfulness Meditation

Meditation for Anxiety: Retrain Your Breathing Patterns

In MIDL Insight Meditation 03 you further develop your perception of the four elemental qualities and the illusionary nature of the borders of perception laid by the mind around them. 
https://midlmeditation.com.au/main-meditation-menu

Insight Meditation 03: Observe Borders of Perception

Stephen Procter

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