Yesterday, I bought a "Heat Wrap" for my mom who is 76 years old. This Heat Wraps is for powerful pain relief and deep muscle relaxation. She is pretty much healthy, but she suffers from Arthritis on her back and both knees. As soon as she put the wrap on her back the heat wrap started getting warm, and she could not stand it for more than 45 minutes. She had to remove the wrap, and she felt a burning sensation on her the bases of her both feet. Now, she suffers from a great amount of pain and she does not have any energy at all. I called to take her to her doctor, but he is on leave till next week. What do you think is the problem and what natural remedy will be helpful in her case?