Welcome to NeuroTalk...

Diabetics lose magnesium daily thru the urine...it is part of the diabetic process for some reason.

So either try taking a quality magnesium supplement (and you might add in some natural vit E oil too), might help. Do not use magnesium oxide as it doesn't get absorbed and into the blood.

You can also try the inexpensive magnesium lotion, (which I now use exclusively), instead. It is available at WalMart for $5.98.
apply a quarter's diameter to your calf daily or twice a day and see what happens.
Morton's Epsom Lotion:
http://www.mortonsalt.com/for-your-h...-epsom-lotion/

There is another poster here who had calf cramping/pain, and she fixed it with bringing her low Vit D up to higher levels.
So you might want to try that. Get Vit D tested, and B12 also, and bring you numbers here. The D used by doctors is D2 and does not work in humans. So once you have a test result I can suggest a dose for you for D3 OTC.