Where do I go?

OP stated they are becoming less alert and more tired, which are signs of losing consciousness. Becoming less alert is concerning to medical professionals and they absolutely DO assess people in that state. Paramedics do come to your home and will perform checks - making an assessment - using their equipment, before taking the patient to hospital, to determine the urgency of the care they require. Some patients are blue light emergencies, others are urgent but will be referred directly to the relevant team when they're at the site, with the preliminary checks and initial paperwork having been completed. A taxi may be faster but, if calling 111, they would likely send an ambulance based on the flags. If you get a taxi you then have to wait to triage at the hospital in the general A&E area, likely queuing and waiting to be called and then referred on again. So yeah, it is poor advice to say food poisoning from a takeaway won't be assessed. Whatever relevance you think that is, it is the symptoms that are signficant enough to warrant 111 sending an ambulance, and since OP is from abroad, has no next of kin or close contacts, they have nobody else to assist and are therefore more vulnerable, and shouldn't be discouraged by being told because they have food poisoning from a takeaway they won't be attended to.