Does your school have a counsellor? Many do. You could ask at the admin desk sometime when the other kids aren't around. I think you need to have another talk with your mum about what you're feeling and how desperate it's getting, and tell her that you really need to see a doctor and ask them about help. Get the phone number for the doctor and ask her to make an appointment, or ask her what day is a good day and maybe you can make the appointment yourself. Take some action and give her a nudge. That's what I had to do. She's probably just got a lot to think about and is finding it hard to get around to it.