It is very difficult to understand what exactly happened to you. It is not
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Clear-atadine children's if you hyperventilated while using the nebulizer and fainted, or actually experienced a respiratory arrest. The former is not so uncommon. The latter is a medical emergency and needs further evaluation. I would discuss the event carefully with your specialist and try to determine the exact sequence of events to understand better whether you need to take other precautions as you go forward.