15 y o daughter does nothing all day

DD has had health issues for 1.5 years now - dizziness, nausea, fatigue, headaches. I’ve taken her to every specialist I can think of, including 2 different neurologists, psychiatrist, nerve disorder specialist, 2 audiologists, plus the paediatric department of a very well known hospital that treats children. We now know she doesn’t have Menieres, Ehlers-Danlos, POTS, hearing issues, balance issues, any neurological diseases, nor heart rhythm problems. Waiting on an echocardiogram appt in January.As a result of these very vague but annoying/debilitating symptoms (depends on the day), she doesn’t attend regular school. She is home schooled because the pace of 5-day per week school is currently too much for her, plus she has many doctor appointments and would miss a lot of classes anyway. Last year she didn’t get all of her credits because of absences. No matter how intelligent you are, if you miss 2-3 days of school per week, you won’t be able to keep up with everything.2 different doctors have now told her to get up and outside the house for at least 10 mins per day, eat regular meals even if she isn’t hungry, and try to be out of her bedroom more. She is in her room sleeping or just laying there for 20 out of 24 hours. She doesn’t eat much because of her nausea. She doesn’t have an eating disorder, we have looked into it.Maybe this isn’t the right subreddit. I know no one can diagnose her and I’m not asking for that. I guess I’m just venting. She’s taking me down with her. I’ve been trying SO hard to find out what is wrong with her. I’ve set up a weekly appointment for her with a social worker starting in January and I hope that will help. She resists all of my suggestions and often says I’m not helping her, which is patently false.DD’s dad is out of the picture but that’s a story for another day. I am remarried for nearly 10 years to a wonderfully supportive man. He is very involved with my kids and always has been. He is not the problem.DD has friends. She socializes online mostly but sometimes in person when they visit her. She and I talk honestly with each other. I’m at my wits’ end. It feels good just to type this and organize my thoughts.Edited to add: she is on a low dose of anti depressants because the psychiatrist (and stepdad and I) believe she is depressed. These meds have helped A LOT, but she is far from ok. via /r/Parenting http://bit.ly/2EXZsYx