Magnesium and kidney pain

Two weeks ago I was overdosing with D3 (5000iu) daily. I had all the overdose symptoms. SO I quit taking d3 and start magnesium chloride. First time when I take it I felt sharp kidney pain. And every next time I take it I feel tightness in the kidneys.
1-2g. in water with a pinch of Sea Salt with plenty of water.
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