Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain persistent cold along with blocked nose with no other symptoms can be due to chronic upper
respiratory tract infection while it can also be due to other common cause that is
Sinus infection or Sinusitis..
I would suggest you to consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigation like throat swab culture, PNS view x ray of the sinuses along with chest x ray and blood tests can help in diagnosis and treatment can be done accordingly..
You can be advised a course of antibiotics, anti allergics, deconestants like Pseudoephadrine, along with steam inhalation, saline
nasal irrigation and use a humidifier in your room..
You can take decongestant
nasal spray containing
Xylometazoline..
You can also chew a Vitamin C pellet daily..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.