Yes, this is a pretty well documented die-off reaction, especially prevalent with Miracle-Mineral-Supplement . You can either experience cold or flu-like symptoms which last only temporarily (up to about 12 hours), or you can actually get a full fledged cold.
Here's what is happening: your body is being flooded by the mycotoxins which are acidic and poisonous. These substances will exacerbate or bring on cold symptoms for a short term until they are flushed.
Aditionally, the pathogens in your body love the environment that is created by these mycotoxins; basically they thrive in their own wastes. So, if the concentration of a particular pathogen is high enough, then when the mycotoxins from die-off increase rapidly, there is a chance of an actual cold or flu developing because of the temporarily polluted environment.