Hi..
Welcome to HEALTHCARE MAGIC..
As per your query the symptoms are pointing towards
Chronic Sinusitis leading to blocked nose and congestion..
Sneezing can be due to
allergic reaction to dust or something else that seems to be present in the room in which you sleep.
It can also be due to irritation and dryness in nasal lining..
I would suggest you to consult an Otolaryngologist or an Allergist and get evaluated and he/she can advise you to get an allergic testing done as well as PNS view x ray and MRI SCAN of the maxillary sinuses for ruling out the exact cause of your symptoms..
In case of allergic reaction ruling out the exact allergens and preventing exposure to it will relieve sneezing..
If allergies are ruled out
Immunotherapy can be given to reduce the allergic symptoms..
If Sinusitis is ruled out Antibiotics, anti inflammatory medicines, decongestants, saline irrigation, Steroid
nasal spray and steam inhalation can help..
If there is polyp in the sinus it can be removed surgically..
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora.