Hi Gem 33. I do feel for you. My oldest is 22 and although she has bad anxiety and anorexia she does appreciate what I do and is grateful although awful to me when having panic attacks.
I do hope your daughter goes to the dr and they're helpful. My 15 year old. I know when I tell my daughter to do things it doesn't work but I still try to, and works when I encourage and given options, so the Dr or something else.
15 year old getting worse, I did dinner and gave her jacket potatoe which she doesn't like. I asked her to have some and leave some - she threw it on the floor and then when I asked her clear it up she picked it up and threw again and then stood on it! Then when I reminded her to clear up she screamed in my face. The advise is no to get into conflict but be there for her - find it hard to take my own advce.
Hope your weekend is calm!