low blood sugar and flushing

Hi all, I'm doing a Liver Flush today Hulda Clark style, using grapefruit juice to replace some of the water as in the directions on this site. When I've done it in the past, even with the juice drinks and the oil at night, my blood Sugar seems to drop and I feel really severly bad. In the past I finally gave in and had a tiny piece of fat free bread, and some fat free mints. Is this really bad? Is there anything else you can recommend to avoid the blood Sugar dips?

Thanks!!!