Thanks for writing for us.
As your doctor has said that on one side of your chest the breath sounds have been rattled.What I understand by that is you have been having Lower Respiratory Infection.In all likelihood you have to go for a Chest X-Ray PA view and Sputum for Culture and Sensitivity in addition to your Blood Counts and Urinalysis
In all probabality your doctor will have to change the Antibiotic//Do Regular Steam Inhalation//Prescribe Mucolytics such as Ambroxol
Nebulise with Bronchodilators//Steroids
if breathlessness does not subside.
Kindly take these steps and consult a Pulmonologist
Dr Lt Cdr ASN Bhushan.