> I was told I was lacking
 > in salt (sodium) and was told to start using sea salt on my food plus put a
 > pinch under my tongue once a day.

There can be a number of mineral salts in your body (i.e., sodium is not
necessarily synonymous with body salts).  You may have been low in potassium
salts (ex. electrolytes).

Craving for salt (sodium chloride) is a symptom of underfunctioning
adrenals.

Rob