Personally, I would admit myself to ER before calling a crisis line because I've read horror stories about them tracing your phone and sending the police to your house. Most cops aren't properly trained to handle people with mental illnesses so they deal with you the only way they know how: handcuff you, shove you into the back of a cop car, be insensitive pricks, and drive you to the hospital while not letting you bring your keys, wallet, and phone which are generally needed upon being discharged.

Talking to friends or IMing people here should be your first line of defense. If that doesn't help, admitting yourself seems to be the path of least resistance.

Anyways, I hope you're doing better OP!