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Hi and thanks for the query,
There is a possibility that Singulair might not have worked effectively. The allergic reaction or the asthma is worsening and in turn aggravating the anxiety which also causes a choking feeling. Since, the two augment each other, I would suggest that you overcome your fear of taking medical help and go to the ER or a nearby urgent care. Airway is the most important thing when it comes to saving lives and a feeling of being choked is a sign of an obstructed or a potentially obstructed airway.
Hope this helps.
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