The way you go IP is by going to the ER and telling them that you are having a mental health crisis. You do not need a doctor recommendation to be admitted to the ER. You'll most likely have to wait for a couple of hours (or longer) but a doctor will eventually see you and ask you some basic questions about the problems you're experiencing and depending on how many beds are available they will move you up to the actual psychiatric unit.

It's important to be cooperative once they've taken you back into the ER because they may kick you out if you cause issues for the staff (or... at least that's what happened to me once).