Thanks for your question on Health Care Magic.
I can understand your concern.
Chest pain, tiredness, lethargy, loss of energy etc can be seen in Pulmonary causes like
bronchitis,
lung infection,
tuberculosis etc.
So better to
consult pulmonologist and get done
1. Clinical examination of respiratory system.
2. Chest x ray
3. PFT (Pulmonary Function Test).
Chest x ray is needed to rule out lung infection and tuberculosis.
PFT is must for the diagnosis of bronchitis.
You may need antibiotics, anti tubercular drugs, inhaled bronchodilators and inhaled corticosteroid according to the diagnosis.
If all these are normal then no need to worry for Pulmonary causes.
But better to get first rule out Pulmonary causes.
Hope I have solved your query.
Wish you good health. Thanks.