Hello and hope you are doing well.
The constant runny nose, 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 chlopheneramine and lovatidine are effective. Nasal decongestant drops too relieve congestion. Please consult your primary care physician for further evaluation.
Hope this helped and do keep us posted.
I hve the same ...mine is caused by environmental allergies ..check out'what on earth are they Spraying' on Utube
For starts, have you tried an OTC nasal spray or an oral antihistamine?