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Sensory nerve damage can produce tingling, numbness, and pain. Pain associated with sensory nerve damage is variously described as:
Sensation of wearing an invisible "glove" or "sock"
Burning, freezing, or electric-like
Extreme sensitivity to touch
These are symptoms of a condition called neuropathy. You can google it, and come up with lots of info. My grandmother has neuropathy, and her only symptoms are in her feet, and they sound exactly like your mothers. There are medications out there that can help...neurontin is one, it is prescription. Hope this helps.
I agree with you completely.
http://www.wrongdiagnosis.com/t/tetany/symptoms.htm
Look up tetany.