Thanks for your question on Healthcare Magic.
I can understand your concern.
Your all symptoms like
shortness of breath,
chest pain, dizziness, headache etc are suggestive of heart diseases.
You also had heart surgeries twice in the past.
So in my opinion, we should first rule out heart diseases in your case.
So get done ecg, 2d echo,
stress test (trade mill test) and coronary
angiography (if required).
If all these reports are normal then no need to worry for heart diseases.
Sometimes acute
bronchitis can also cause similar symptoms. So get done clinical examination of respiratory system and PFT (pulmonary function test).
You may need inhaled bronchodilators.
Don't worry, you will be alright. First diagnose yourself and then start appropriate treatment.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.