Real answer? Social Services is probably the number to call unless there is a emergency medical issue in which case just regular 9-1-1.
Likely you will either ride in an ambulance or with two social workers in a car to the hospital. 24-48 hours out-patient while you are stabilized. If it is a temporary situation, say you had an insanely high fever and were delirious you would just go home. If it wasn’t temporary highly likely assigned a case manager for placement.
Despite what you see in the movies/TV you will not be thrown into an mental institution you will not be forced to take a cocktail of drugs that make you a zombie.