I"m so very sorry, Pmm!!! Emergency rooms are no fun at all.
"In a person without diabetes, ketone production is the body’s normal adaptation to starvation. "
/goo.gl/UDBfY1 It just means you are burning fat. If I remember correctly, aren't you struggling with keeping weight on? If so, this is a warning for you that it is still going on and that you need to find ways to stop loosing so much weight.