Talk to the care providers at the hospital. Make it very clear you need support. Explain what happened last time and how you felt.

Can someone stay with you at the hospital? Partner, friend or parent?

Good luck
^^^^^ this.

You need to talk to the hospital now and explain your situation. If they don't know about it, if and when they happen, they won't know how to handle it. If you are honest and clear about what could happen, how you feel, and that you need support, they should be able to help you. (they'd be heartless if they didn't.)

All the best