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A collapsed lung would cause significant breathing issue and cannot last for seven months. Collapsed lung would not cause painbut breathing problems like difficulty in breathing with slightest of physical activity. Also it would not cause intermittent symptoms. With a CT scan and chest x-ray being normal it categorically rules out a lung ailment. These investigations won't miss any diagnosis especially the collapsed lung. Addiction with the pain medications can be a possibility with your description and need further probing for this behavior.
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