Most definately look at physiological reasons as well as psycological. Sensitivity to things aromatic are extremely prevalent. Some oils are not even noticable to the nasal senses yet very powerful to physiological and psycological reaction. And unfamiliar body positions can put stress on the body too. Any or all of these can put stress on the overall system so as to cause reaction in the Sympathetic Nervous System and that can render one very weak and ill feeling indeed.
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