I went to the ER once because I was feeling suicidal, basically the admitted me in the ER had me go in a room and someone was there to watch to make sure I didn't do anything suicidal. Then they gave me hospital clothes(if you call them clothes, but whatever) to change into from regular clothes had my mom who drove me there take my back-pack, shoes and other stuff home with her...And ended up admitted to the psych ward of that hospital, it was a small kinda crammed section of the hospital, staff was ok but some made me rather uncomfortable and food was kind of terrible, not much in the way of therapy or anything either.

Then another time I was feeling suicidal and told my therapist who called 9-11 or whatever got taken to an ER on suicide watch and was there until they found a psych ward with room...that one was a better facility in my opinion, of course having to go to the psych ward over all is not the most pleasant thing. But in my experience they tend to take it rather serious when it comes to suicide if you make it to an ER when feeling suicidal.