Hi,Dear,Thanks for your query to HCM.
Dear I read your query and reviewed it with context to your query facts.
I understood your health concerns and feel Concerned about them.
Based on the facts of your query, you seem to suffer from-
Post-nasal drip from 
Sinusitis with Chest infection/
Bronchitis.
Subdued reflexes during sleep lead to cause bronchitis and chest congestion when accompanied with post-nasal drip with Sinusitis and is  of very  common occurrence.
Check with Sinus X-rays and treat the 
Rhinitis with Allegra and Nasalcrom(Cromolyn) 
nasal spray / and intranasal spary would reduce this complication in resistant type of sinusitis with allergic triggers.
Allergy Shots-inj for 
immunotherapy are also a good option to contoll this complication.
Hope this would help you to reduce worry with your problem.
Take care and wish you to recover fast and Live healthy.
Hope this reply would help you to plan further treatment with your family and specialist doctors there.
Welcome for any further query in this regard.
Good Day!!
Dr.Savaskar M.N.
Senior Surgical Specialist
M.S.Genl-CVTS