Sounds like you have erythrodermatitis. Here is a website that shows some photos of erythrodermatitis:
You need to see an immunologist who will perform a series of blood tests to check for immune dysfunction. Please see your primary care physician to refer you to immunology. They may perform some tests to check for anemia, inflammation (ESR), IgE antibody
, and other tests. Please review the following emedicine article:
As you will notice, there are many possible causes of erythrodermatitis. Your immunologist will determine which may be the cause affecting you. You may also note that although itching can occur, it need not be present. A rash all over the body, chills, and low temperature are part of this illness.
I hope this helps. Take care.