could be from low magnesium, j. also, combined with the blurred vision, you might want to consider zinc. what's your diet and supplement regimen like, IIMA?
odd sx? no dx? check w/ dietitian
DRI=MINIMUM eg bit.ly/1vgQclQ
99% don't meet these. meds/lifestyle can affect levels
status can be low in ms & other cond'ns
'but my results are normal'. typical panels don't test all
deficits occur in 'normal' range