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If you have not seen an ENT doctor, then you have to consider seeing one. You suffer from nasal congestion that is seriously interfering with your life style and ability to breath freely. Acid reflux has nothing to do with this. This degree of nasal congestion could be associated with a number of pathology of he nasal cavity such as chronic inflammation, polyps, deviated symptoms and chronic sinusitis, to name few. You will need thorough evaluation of your nasal cavity by an ENT doctor who is likely to order some Xrays. Most of these pathologies are treatable when identified.
The chronic use of nasal decongestant does not help as you can easily become addicted to it, meaning that you can not breath without it. It also leads to the dryness in your nose and mouth as it interferes with the natural humidification of the air through the nose. See an ENT doctor
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