Thanks Margypops - I'm going to watch that myself
May also be environmental allergies, caused by the aerial spraying we are all being bombarded with check out the video 'What on Earth are they Spraying'
I take EDTA a chelating agent like once a month. I don't have lead, but I have high iron. EDTA chelates heavy metals from the blood and body. But you have to take a good multiple vitamin afterwards as it also removes the good elements from your body. You might want to try it to see if it helps. I don't know what the ceramic clay could possibly contain to cause this problem, but it is dirt and could have something in it that caused an allergic reaction. A lack of Magnesium also causes insomnia and a whole lot of other symptoms.