Thanks for your question on Health Care Magic.
I can understand your concern.
Since you are having recent travel history, possibility of either
lung infection or
bronchitis is more for your symptoms.
Your symptoms like headache,
dizziness, weakness,
nausea and breathing difficulty are common in both of these conditions.
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.
PFT is needed to rule out bronchitis.
You may need antibiotics, inhaled bronchodilators and inhaled corticosteroid. So first diagnose yourself and then start appropriate treatment.
Hope I have solved your query.
Wish you good health. Thanks.