Hi...
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns...
As per your complain it seems like
Sinus infection leading to
sinusitis and as due to inflammation of the sinus lining there can be secretion of inflammatory exudate as well as there can be mucous accumulation in the
sinuses and as the sinuses drains from nose the fluid from sinuses comes out from nose and feeling of cold like symptoms can be due to nasal dripping and congestion..
It can be due to allergies, sinus infection caused by bacteria or sinus polyp..
You should consult an Otolaryngologist and get evaluated and a PNS VIEW x ray or an MRI Scan can help in diagnosis and treatment can be planned accordingly..
For infections antibiotics can relieve..
Allergies can be treated with antiallergics like Levocetrizine [this you are already taking] and others like
benadryl.
Sinus polyp needs surgical removal..
As of now you can take
steroid nasal sprays, do steam inhalations and saline irrigations..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.