What were the symptoms of the cold? I have had sinis problems most of my life and often get a runny nose and mucus in the throat during a fast. The body will use the same pathways it is used to to remove gunk that it is used to using as well as others which are only activated to a large extent during a fast. Also it has recently been explained to me why we often get sore throats during a fast- that is due both any acidity in the area at the time and also that the throat lining is replaced during a fast leaving it raw for the duration of that replacement and more susceptible to the acidity!
Well done on completing the six days and good luck keeping your diet healthy. :)