Thanks for your question on Healthcare Magic.
I can understand your concern.
You are having breathlessness,
dizziness, unwell feeling after heavy exertion (running).
So we should definitely rule out heart and lung related diseases in your case.
So better to
consult doctor and get done
1. Ecg, 2d echo and
stress test (trade mill test) to rule out heart diseases.
2. Clinical examination of respiratory system and PFT (pulmonary function test) to rule out lung related diseases like
bronchitis.
If all these are normal then no need to worry for major heart or lung related diseases.
Sometimes anemia (low
hemoglobin) can also cause similar symptoms. So get done hemoglobin estimation and if deficiency then you may need supplements.
Don't worry, you will be alright. But first rule out heart and lung diseases.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.