So your electrolytes might be messed up. If so, that can cause severe symptoms. My friend's mother was hospitalized twice recently due to abnormal electrolyte levels. Chelation could easily mess up mineral levels. The chelatiors don't just cause mercury excretion. Other minerals are lost as well. Have you stopped the chelation? Perhaps it does make sense to get some basic blood tests done since you feel so awful. If I was in your position I would stop the chelation for a few months, then restart it slowly.