cold feets

my mom is suffering from this unusual disease .During morning she start feeling cold in legs and after that she start feeling dizzy and cannot work .she lie in bed covering blankets and after hrs she 'll wake up when the feet's are warm.
As yrs before she has a medicine prescribed by a doctor (the medicine was for tension)after that suddenly she felt this way and recommended the another doctors.we still don't know what is the actual problem and how it can be solved.please help me.

[Dr Sharma]

Hi there. Cold feet can be due to the weather, stress, emotional disturbance, frostbite, hypothyroidism, peripheral neuropathy, peripheral vascular disease and raynaud’s phenomenon.
The foot may be cod, numb and like a block of wood, there is a risk of injury due to blunted sensations. Certain blood tests to check the clot formation ability of blood, certain cryoglobulins, thyroid scan, xray feet and bone scan to check the extent of damage to the  bone may be required. Treatment may include avoiding cold exposure, over the counter analgesics, limb elevation and drugs that cause vessels to relax in raynaud’s disease. Consult with a rheumatologist soon. Take care