You most likely have some kind of allergic rhinnitis. You haven't specified enough information, so my best guess with limited info is allergies. Of course you may have some underlying bronchospasms leading to difficulty breathing, but you would have like been diagnosed with asthma. Other causes of upper airway congestion include nasal ployps, enlarged adenoids, tonsils, abnormal nasal anatomy. I would start with a trial of claritin, or other OTC anti-histamine. If that doesn't work, consider ENT visit who will hopefully then work you up.
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liz
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