For me the hypermagnesium showed up as increased dehydration (it lowers sodium...so this is a concern for this with AF)
I actually go INCREASED anxiety. Possible since the loss of sodium mad more work for my adrenals trying to retain sodium.
My skin became super scaly and itchy, possibly from the hypocalcium that results with hypermagnesium.
And I have had this weird bone ache ever since that has gotten better not completely stopped since I backed off on the magnesium. I still can't quite figure that one out. But from from log book, the timing is exact.