How do I tell my therapist

To be completely blunt I stay up at night thinking about self harm. Not in any typical way, but by drinking Celsius since it makes me seize and have to go to the emergency room. The thing keeping me from this is knowing that I won’t be able to drive for 6 months.

I know I have to go back to therapy and work through these emotions. However, I’m scared that she will send me to a hospital.

How do I tell my therapist about this?