Another thing to consider is the potential to disrupt your overall electrolyte balance by taking high doses of magnesium. I know those doses on me would cause loose stools or even diarrhea. This would contribute to the loss of other minerals. Magnesium glycinate may be a better form to take if the citrate is causing loose bowels.

Your kidneys may be on overdrive since they are responsible for clearing excess magnesium. If they cannot keep up with it, then you may be experiencing toxic effects from it.

Also, have you had your B12 checked. Taking B12 as well as a good B complex can help.