Hi sir, in my opinion you have sinus infection
Thick green mucous is because of chromic sinusitis
If I were your treating doctor , I would have advised for culture and sensitivity of nasal secretions, depending on the culture report I would have started treatment.
When z pack is not working we can switch over to better antibiotics.
Culture report will help us to decide it.
If infection does not control with oral medicine, then intravenous antibiotics, decongestant, antral wash would be advised. CT scan
is the investigation recommended to know the condition of sinus.