Hi,
Noted the history of nasal blockage particularly at night, saw a Doctor who prescribed 
Azithromycin saying that you have upper 
respiratory tract infection but the coughing continued with mucus had fever and 
body ache. Since you have not mentioned about the 
anti-tussive meaning to suppress cough and anti-inflammatory medicines to have symptomatic and supportive treatment.
Hence I would advise you the following:
- Continue Azithromycin
- Take decongestant nasal drops followed by plain water steam inhalation
- Take an anti-inflammatory like 
Ibuprofen if it suits you
- You can take cough syrup to suppress the cough
- Take rest and have maintained room temperature.
Rest of the treatment as per the advise of your doctor after clinical evaluation and investigations of blood and so on.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General Surgeon