I recently experienced an unusual breathlessness while deplaning and walking
I would explain as follows:
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After passing carefully through your recent concern, I would recommend performing a medical check-up including a careful physical exam coupled with additional tests (complete blood count, resting ECG, cardiac ultrasound, chest X ray study).
Only after excluding any serious cardio-pulmonary disorder, you may discuss with your doctor on the possibility of reviewing your neurological therapy.
Hope to have been helpful to you!