Is it possible to mentally control your allergies?

Many years ago, I had bad allergies. I lived on OTC allergy medicines that made me feel either sleepy or wired. And I still had allergies. One day I told myself enough was enough. I realized that the piece of animal dander or pollen wasn’t big enough to hurt me, that I could absorb it without harm. And I decided I would blow my nose until either it fell off or my body went along with my mind. I haven’t had allergies for decades now. Has anyone else experienced anything like this?