Hi Dear ,
Welcome to Health Care Magic Team.
Understanding your concern. As per your query severe cough, post-nasal drip and
sore throat pointing towards a condition known as sinusitis. You should
consult doctor so that he can diagnose you properly to find out exact cause , he can review symptoms and take physical examination .Doctor can refer for CT scan and blood test. It could be due to There could be many causes for sinusitis like cold ,nasal polyp,respiratory track infection ,deviation of
nasal septum and weak immune system due various diseases.
Treatment of the sinusitis depends upon the cause .If the sinusitis is due to bacterial infection then doctor can prescribe antibiotics along with antihistamines and decongestants which relives the symptoms like
post nasal drip.Antihistamines(benadryl) are also effective if the causative factor is allergy. You should use
mucolytic agent like ambroxol to make mucus thin which can be easily removed . Apart from this you should take steam twice a day which will give relief from congestion , also do warm saline gargles. Avoid cold carbonated beverages.
Hope your concern has been resolved.
Get Well Soon.
Best Wishes,
Dr. Harry Maheshwari