I'm so sorry to hear you're feeling like giving up. I'm also sending you an email. It's really important to talk to someone about what is going on for you right now - it sounds pretty frightening.
I know you have reached out to support services in the past, so please do so now. Here are some numbers again:
Lifeline: 13 11 14 or Crisis Chat
Suicide call back service: 1300 659 467 or online counselling
Samaritans: 135 247
If in immediate danger: 000
You can also call the hospital. Even though you were sent home this morning, it doesn't mean they won't be able to help you now if things have become worse for you. You are welcome to keep using the Forums as a support, but it's really important that you contact a crisis service if you are feeling unsafe.