oh dear, Rose, that's terrible. I do hope you are able to get proper attention and treatment. Depression is an illness and you are entitled to get treatment, not to be put at the bottom of the list. And as for what that nurse said to you!!! That, surely, is a reportable incident to the hospital management.

Triage usually works well, but in the case of mental illness, there is still a lot of ignorance among nursing staff. When a patient comes in and is polite, non-violent and well-behaved, they assume we're okay! It happened to me lots of times. Too many times. One nurse who came for a home visit after I went home from hospital one time, said she would stop coming to see me because she thought I was doing pretty well!!! Just because I made her a cup of tea and had a polite conversation with her. She said she had "sicker" patients, one who had set his bed on fire. At the time, I thought, oh, okay.
Now I know better, I would say something like "Just because I seem to be functioning well on the outside, and I'm not violent or suicidal, doesn't mean I'm okay. I'm actually not okay, not at all, and I need to see a doctor - NOW".

HTH and wish you the best. If we can't go to hospital when we are sick, then where on earth are we supposed to go??? Try to ignore those stupid nurses, BTW.