Refeeding - extremely low BMI

Has anyone experienced refeeding?  I have had quite a few mishaps and my weight has continued to plummet.  I have been at an unhealthy weight for months now, but my docs didn't know what to do.  I finally saw a nutritionist who said I'm in danger of refeeding (which I had never heard of).  Apparently there are only a few places in the US that treats it which I find astonishing.  I've heard that Kings University in London has a wonderful program, but I'm a long way from London.