Treatment of patients at casualty

I would like to express my dissatisfaction of how the emergency department/casualty at Linkfield Hospital is operated. It’s now 23:10 and I have been sitting with my patient from past 9 who’s suffering diarrhea and also vomiting. To this point we haven’t seen a Dr, there’s also other patients on the queue which we found here and they have probably been here longer than us. After asking the nurse at the reception why are patients waiting for long to be atttended she answered by telling me they are prioritizing patients who got fetched by an Ambulance and the rest of the patient can wait. She further added that they only have one Dr on duty after 10pm. My question is, why is this an emergency department? Do we not come here because we expect emergency healthcare? Why do they have only 1 Dr on duty irrespective of the queue or condition of patients on the queue? Do I need to call an ambulance to fetch me for my condition to be given attention? There’s clearly no difference between the treatment at Government and Private Hospital!