Runny nose and sneezing are characteristic of rhinitis (inflammation of nasal mucosa )
It can be allergic in most cases but if it persistent vasomotor rhinitis (due to inappropriate nerves and blood supply of nasal mucosa )
So halting the inflammation is prime key in treating any kind of rhinitis
Next Steps
try newer antihistaminic drugs with nasal decongestant
Health Tips
some routine exercises will activate nasal decongestion and try steam inhalation