Over the counter, 12 hour nasal spray had been working for me!
Hi,
The common causes for severe sneezing include allergies( to dust, pollen, pets, food etc), vasomotor rhinitis, upper respiratory infection, common cold or flu etc. You need to make note of what is causing a bout of sneezing in your case and try avoid it. Sudden severe sneezing is most commonly due to allergies, also as your symptoms are relieved by Claritin allergic etiology could be present.
If severe allergy is present for multiple factors then immunotherapy should b e considered. Best.