Hi, the constant sneezing and nasal congestion could be due to vasomotor rhinitis, in which the symptoms occur in response to a trigger, like eating spicy food or going outside in the cold. The primary treatment is simply avoiding the things that trigger your symptoms. It is often treated with a drying nasal spray (like Atrovent) and antihistamines like chlorpheniramine and loratadine are effective. Nasal decongestant drops too relieve congestion. Please consult your primary care physician for further evaluation. Regards.