Freezing insides but skin warm to touch

My mother is 74. She has fibromyalgia, RA, had thyroid disease when she was young, and had half of it removed, she has Spinal Stenosis too... and she is Bi-polar... for the past couple of years - though it is worsening now, she has been getting flashes of ICY COLD inside her bones... that last sometimes for hours, though her skin is warm to the touch - it is not a FLU... or a virus.  

Today we took her temperature and it is 97. She is covered with 3 blankets and the heat is on 82.  She is still cold, shivering even. The temperature outside today is 88.  It doesn't matter if it is winter or summer... its always the same... does anyone have any ideas how to combat this problem?