Thanks for your question on Health Care Magic.
I can understand your concern.
By your history and description, possibility either lower
respiratory tract infection (LRTI) or
bronchitis is more.
Because in both these conditions
dry cough, fatiguability, cold feeling etc are seen.
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 LRTI.
PFT is must for the diagnosis of bronchitis.
He may need antibiotics, antihistamines and anti inflammatory drugs.
Inhaled bronchodilators and inhaled corticosteroid (ICS).
Don't worry, he will be alright.
First diagnose himself and than start appropriate treatment.
Hope I have solved your query. Wishing good health to your husband. Thanks.