Reads like damp - are the walls still damp? Has the window been replaced with a sealed unit that doesn't have a vent - houses have to be ventilated, especially old ones. Could be the wooden floor under the laminate is rotten or at least very damp and rotting slowly. A damp meter survey (of the downstairs cieling too) might be useful - they can be hired or bought.
Has the room been painted recently [http://www.bbc.co.uk/blogs/watchdog/2010/05/crown_paints.html]
although I would add that a search of the internerd will highlight odour issues with other manufacturers of paint other than Crown.
CO2 - how high is high? That could be due to rotting timber??
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