this may not have anything to do with it but has anyone checked yr magnesium level? Couple yrs ago we tried the Rosedale Diet , which is radically low carb

about a month into it my DH and I both started getting odd and quite severe muscle cramps in various places including what you describe - Rosedale said in his book that this might happen (!!) and to increase yr magnesium intake.

It works, but maybe low carb screws it up permanently, I don;t know. It has been two yrs at least since we ditched that crazy diet and I still get the muscle cramps if I don't take additional magnesium on a DAILY basis.

anyway, who knows if this will help you, thought I would mention it just in case. <<hugs>>