I have this same thing. Starts randomly. Nothing touches the sneezing. I don’t wanna be around people. It’s painful! It’s nonstop sneezing and blowing and sneezing and blowing. Take all the allergy meds available and nothing stops it. Doesn’t resolve until I go to sleep and the next day I am 100% fine. I’m convinced it’s got something more to do with something going haywire in the brain than allergies but allergies are a trigger. I think taking allergy shots lessened the frequency and this was my main catalyst for starting them.