Unstoppable Sneezing

Hi,

I'am john . I have a sneezing problem, Ihave shown to some doctors but no solution.They say its some type of allergy & some say that these are the symptoms of migraine ,

In detailed ; before sneezing i get a irritation in my upper part of the nose walls like something is crawling there and the sneezing starts that is unstoppable and unbearable to me and my surrounding .

so i need help.

so if u have any solutiopn or result then reply pls .

thank u.