45yr old female, no known previous health issues, chronic post nasal drip . Started to have episodes of sudden feeling of nasal passages closing/inability to breathe through nose; worsens progressively and leads to inability to get enough air even with mouth breathing , progresses to light headedness, can t stand without feeling will pass out, lasts for about 10-15 minutes then slowly resolves on own but takes about another 30 minutes of sitting to be able to then continue with normal activity. Doesn t occur with any known trigger, not associated with activity (can just be sitting and talking and will occur).