Why will the school counselor make it worse?

Do your parents know you cut and think about suicide? My parents finding out that I did sent me to a hospital so fast.

Did your therapist know you felt these things because if they did I have a feeling you'd still be seeing one?

Maybe you could call your old therapist. Maybe she couldn't help you then, but maybe she can help now. You could try telling her these things:

I'm cutting.
I'm thinking about suicide.
I'm constantly overeating.
I'm out of control, my parents aren't taking me seriously, and I need help.

Maybe she couldn't help you in the past because she didn't know you were feeling these things? You could talk to her about it, how you felt better for a while but then bottomed out, and if you could work to make it different this time.

Telling her about it means that she'll help you talk to your parents. They'll take a shrink seriously. Maybe in the end you should see someone different. For right now, it might be easier to get back in touch with her.

Also, I notice I get angry quick and easily. I've read that anger tends to mask shame. In my case, I realize it has. Do you feel shame?

If I've misunderstood, please forgive me. But don't give up. My parents were rubbish when it came to admitting their progeny may be mentally ill. That just means I've had to depend on myself.