this is to do with your adrenals, which are having a hard time producing cortisol and maintaining blood sugar. I have this a lot too and I am on full adrenal support. Are you weak, shaky, thin, can't put on weight, don't digest food properly, can't sleep properly, look terrible, hypoglycemic? All these are symptoms of low cortisol. You really need to see a good endocrinologist to get tested and then possibly put on cortisol replacement, ie replacing the cortisol your adrenals can't produce anymore because mercury has messed them up.

http://www.drrind.com/scorecardmatrix.asp

Nicola