A person with anorexia do they have problems of their whole skin head to toe falling apart ? feeling very soft , very loose hanging skin etc or no?

YYes: Yes you can get scurvy pellagra etc. See your doctor to get help. You have to get the proper nutrition for your body to work correctly.

Yes: A person in anorexia is in a state of malnutrition. Without the necessary nutrients, the skin can show changes such as you describe. Unfortunately, this state of starvation/malnutrition has serious effects on all body organs, and can cause death.