While it can be anxiety I would still get tested to rule out any lungs condition.
Yes a common symptom of anxiety is shortness of breath. But also when you are ill anxiety can be an alarm your body is sending so this is why I suggest you get tested but you didn't give us a lot of information regarding your problem so short answer you got.
Magnesium and Potassium are required for proper muscle function, which would include muscular function of breathing. Magnesium deficiency can also cause anxiety, depression, panic, muscle/nerve problems, etc. You could be low in both.
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