Our expert says:
If you've been to a clinic, I assume they did an exercise induced asthma test? That's a test where you check how well you can breathe after doing a little bit of exercise. I think that might be something to consider.
Otherwise, it might be a simple question of gradually adapting your body to the higher intensity of running. I don't mean to trivialise here, but it's not unusual to experience severe shortage of breath, especially after a bit of a lay off. If it's definitely not this, then I would suggest bringing up the possibility that you have exercise induced asthma.
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