Hello and Welcome to ‘Ask A Doctor’ service. 
I have reviewed your query and here is my advice. 
As per your complain it seems that the symptoms symptoms of 
severe sneezing,runny nose seems to be due to 
ALLERGIC RHINITIS and it can be due to causes like 
allergic reaction to irritants like pollen, animal danders, dust and mites and at times even certain trees and grasses..
I would suggest you to consult an Allergist and get evaluated and a thorough clinical evaluation and 
investigations like allergic tests like 
Patch test, RAST test, food challenge test etc can help in diagnosis 
and treatment can be done accordingly..
The tests will help in ruling out the exact cause of the allergen and once you know the cause of the 
allergic reaction you can avid exposure to it to prevent allergy attack..
You can also take anti allergics like Levocetrizine, Allegra etc along with steroid nasal sprays to relieve 
the symptoms..
Do steam inhalations..
You can also be instilled an 
Immunotherapy that will help in reducing the severity and frequency of 
allergic attack..
Hope I have answered your query. Let me know if I can assist you further. 
Regards, 
Dr. Honey Arora