I took afrin, no drip, servere congestion nasal stuff for your nose. And now I have been sneezing all day. How do I stop it?

Antihistamines. Allegra (fexofenadine) is a good antihistamine to reduce sneezing. The dose is 180 mg per day. I recommend you see an allergist to determine if an allergy is the underlying cause of your symptoms because the best treatment is to avoid the cause. Aside from avoidance and antihistamines, the third way to treat allergies is allergy injections.