Hi, Fiz
I was just checking out the Raw forum cause I'm interested in it and learning as much as I can. Trying to change my diet away from SAD to more raw, whole foods and juices.
If you like, I suggest you pose your question to "Shelley" on the 'Ask Shelley' forum. She is very knowlegdable about health and nutrition. It sounds like you are having such a strong craving because you have a real nutritional deficiency of some sort, your body's way of getting your attention to what it needs. Now what potatoes signifies in terms of nutrition/mineral deficiency, I'm not sure, but I'm sure Shelley would have some ideas.
Since it's been over a month, maybe you've already figured it out?