Hi confusedmom,
We went through the same thing a few years ago with our daughter. She was 18 so there was only so much we could do. She had all the classic symptoms your daughter had. Reaching out like you are on this forum is so important. We did the same thing and were surprised how open and willing other families are to share and offer help. It sure helped us, we thought we had lost her and she is now 21 and doing better on meds, help, etc. Two things we did you may want to try. 1- she joined on online support forum like this herself, to connect with other teenagers that really helped her understand what she is going through, and it's going to be ok with meds and therapy. Because the reality is many people going through this are just as scared and confused as we are as parents are....they don't know why they are feeling this way.....and 2- check out a great book called "An Unquiet Mind", by a clinical psychologist who went through hell and back and is now a therapist herself. I highly recommend it! Best wishes for you and your family.