Thanks for your question on Healthcare Magic.
I can understand your concern.
In my opinion, we should rule out
lung infection and
bronchitis first.
Since she is diabetic, post operative patient, having cough with chest congestion and chills (shivering), chances of lung infection (pneumonia) and bronchitis are more.
So better not to take give haphazard drugs.
Consult pulmonologist and get done
1. Clinical examination of respiratory system
2. Chest x ray to rule out lung infection
3. PFT (pulmonary function test) for the diagnosis of bronchitis.. She may need antibiotic, inhaled
bronchodilator and inhaled
corticosteroids and mucolytic drugs.
Don't worry, she will be alright but first diagnose her and then start appropriate treatment.
Hope I have solved your query. I will be happy to help you further. Wishing good health to your wife. Thanks.