I am currently experiencing with it and I will post again once I have had results so I can comment on it accurately, but I think low dehydroepiandrosterone (DHEA) might be the culprit.
`DHEA can be understood as a prohormone for the sex steroids. DHEAS may be viewed as buffer and reservoir. As most DHEA is produced by the zona reticularis of the adrenal, it is argued that there is a role in the immune and stress response.[who?]` Source: http://en.wikipedia.org/wiki/Dehydroepiandrosterone