You have a condition called Allergic Rhinitis which presents with recurrent attacks of sneezing, nose block, itching and watery discharge
Next Steps
You should visit an ENT specialist nearby and get your allergy test and serum IgE done. Thereafter you will be started on anti allergic medications which will include nasal sprays.
Health Tips
Try to avoid exposure to dust, smoke, sudden change in temperature. Using a mask helps.