We understand how you are feeling even if the people in real life don't. Keep posting here and let us know how you are going. Try writing in a journal and please be honest with you CPN and SW. Try to go to sleep and wake up at regular times and try to find things that you enjoy doing during the day. Make plans for yourself then make yourself do them - coz it can be really hard to get motivated so write lists even with things like getting dressed and having showers, reading books, drawing, writing in your journal etc...
I think a crisis plan might be a good idea. Maybe it will help to get your family involved, though I do understand not wanting them to know as your mum has been so negative.
Keep posting, sending you lots of hugs.