ALLENTOWN, Pa. – Ten hours a day, every day, Elizabeth Feudale-Bowes confines herself to a galvanized-steel-and-porcelain shed outside her house. Inside are a toilet, a metal cabinet, a box spring with the metal coils exposed, and a pile of organic cotton blankets. Aluminum foil covers the window. The place is as austere as a prison cell — but it's also her sanctuary from an outside world that she says makes her violently ill.

She and her husband call the structure "the bubble."
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