Thanks guys thats actuallly what my Neuropath said to me, that she thought most of my Mercury load was in my spine. She said toxins can actually move up and down your spine which is also why the nervous system is so badly affected. I think I need to chelate badly, cos it seems like in the last two months my body is falling apart. Symptoms returning that had gone and new ones , like some of my fingers move by themselves, muscles go into agonising spasms and eye twitch has returned. Worst thing is the insommnia. Thats always been my worst. It drives me crazy, i can feel exhausted, but usually only get 2 or 3 hours a night. I've tried everything but nothing seems to work. Well challenge test Wednesday and 4 hours Iv chelation. Maybe that will get it moving. Fingers crossed. Tracy x