But one 24-hour Sudafed, two Advils and three cups of coffee later, I felt perky.

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Type II would be if the intervention fails to distinguish meth users buying Sudafed from those who have colds.

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So if you make Sudafed hard to buy but it does not have a lasting effect on meth abuse, that would be Type I error.

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Now, after a week of Sudafed by day and NyQuil by night, I sometimes can't tell whether I'm coming or going--and the loony bin doesn't seem far off.

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If, on the other hand, his experience is isolated and all is well otherwise, I wouldn't make a big deal out of it -- especially given the Sudafed exposure.

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The fact that you had given him medicine that can affect mental functioning (Sudafed in this case) is also encouraging, because that might be an explanation for his experience.

CNN: Is my 10-year-old hearing voices serious?