What Is The Cause And Treatment For Sneezing Attacks?

I suffer from severe sneezing attacks, at least once or twice a day, everyday. My nose is often running, and i go through at least 2-3 tissue boxes each week. I suffer from a blocked nose at night and sometimes during the day too even despite the runny nose and sneezing fits. I also often breathe through my mouth, often snoring heavily and find myself generally tired and lethargic. However these sneezing and cold like symptoms are now becoming embarrassing as they occur with such frequency. My work and daily chores are affected, I m snappish and irritable and really need some help and or suggestions. I m 26, about 165cm and weigh 62 kilos. I ve had acute nephritis as a child aged 6, but no other significant medical history.