Not sure where you're at, but ERs do a terrible job at least here of treating symptoms that are not acute, life-threatening, and easily treated. Ime they just kinda do bloodwork, a urine test, and if your symptoms say "hey, I might die in the next hour if I get sent home right now," an ECG or a CT scan. Yeah, they may do the easy stuff for ridiculous prices and send you home, like give you potassium pills if your level is at 3.1 or a hydroxyzine if you haven't slept in five days, are hallucinating, and are babbling about how the neighbor's dog is stealing your soap but do not actively say "I am going to kill someone/I am going to kill myself."

You can try though. If something IS off that they see with what they look at, they will at least be able to help out if acute treatment is imperative or tell you what kind of specialist you need to be referred to. With all the vomiting you've done I'd be surprised if you had an acceptable amount of H20 in the ole sack of cells and they'd at least be able to give you IV fluids and see if IV zofran or even a shot of phenergan for the nausea. That could be helpful at least temporarily.