Is there anyone that you can talk to-- a school counselor, an area mental health center, a call center( where you can call a number and talk to a counselor or support person )?
There may be a resource out there that you can connect with until your appointment. I know that before I was first diagnosed with depression- I knew there was something wrong but had trouble reaching out. I used what was called a warm line ( a caring friendly supportive voice on the other end of the phone) and it really helped. There are a lot of people that care and want to help.