How long has she been throwing up, and is she having any other symptoms? I suggest you call asap. They often have same day availability and are open til around 8pm. Also you can apply for Care Credit. It's a credit card that covers most pet care needs as well as human needs.
Call and make an appointment might get you in the next day
Try PAWS
I can't afford to. Do you know where I could get a grant to help pay for vet visits?
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