I agree, you should see a consultant. Although it's rare, a situation can occur where there's a polyp or a growth in one of the large airways which can obstruct air flow. At the least you should get a chest x-ray and probably more detailed imaging of the chest. Your consultant may even order a camera tube test to check for any obstruction as sometimes this can be missed on imaging. If it still persists then you should see a respiratory therapist who can assist with breathing exercises but first you must go the consultant route to make sure that there's no underlying causes.
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