Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that you started with suffering from Upper
Respiratory Tract infection commonly known as common cold and
sore throat, runny nose and cold is due to it and you have developed
sinus infection or Sinusitis due to it and it is leading to congestion and coughing can be due to
post nasal drip that is causing
throat irritation..
You should consult an Otolaryngologist and get evaluated and if sinusitis is suspected which looks most probable in your case he can advise you to get MRI or PNS View of the sinuses or Nasal Endoscopy done to confirm the cause and treatment can be planned accordingly..
For sinusitis he can advise you to take antibiotics like Augmentin, anti-inflammatory painkiller like Ibuprofen, take decongestant like Pseudoephadrine [sudafed],, steam inhalation, saline nasal sprays, steroid nasal sprays and use a humidifier in your room..
For sore throat you can do warm saline gargles and suck throat lozenges..
Avoid spicy , hard and chilled foods..
Hope this information helps..
Thanks and regards.
Dr. Honey Nandwani Arora.