did i understand you are taking caprylic acid/myrrh right now during detox symptoms? that may be messing with your system while your body is trying to do its own work. i understand the detox can be quite uncomfortable, but it is best to ride it out. it should pass. if you really feel all wrong, then i think a fast is contraindicated, given you are already underweight. perhaps you should look into the Candida Forum and other forums dealing with your particular issues. get them worked on first, then try fasting later. sometimes, a fast really may not be the best thing.