It is not simple to figure out how one is affected by mercury in the brain. My theory is that it may have significant effects on the hypothalamus, and therefore throw many body systems out of balance.Things like body temperature and blood pressure maintenance may be affected. If the body temperature stsys low, many different problems can result. I often find that my temperature is low when I have the worst stmptoms. It might be in the 96.5-97.5 range. The strange thing is that I might be very heat intolerant and sweating greatly when my temperature is 96.5.