Only option here where I live, is calling police. They take you to the hospital in handcuffs for the evaluation. One lady cop boasted to me about how they have more authority than doctors to have people 5150'd.

Once when pdoc made my daughter agree to be admitted, pdoc let me drive her down to hospital.

A mobile crisis unit sounds pretty good, they would probably talk to you and help assess whether you need to go in hospital or not.