Vomiting baby

My daughter won’t keep nothing down… every time I feed her she throws it back up and it’s like a fountain LITERALLY…. She’s 8 months, she was just fine yesterday and this morning.. now all of a sudden she’s not keeping nothing down!! Has anyone ever dealt with this? I don’t want her to become dehydrated!!! Could she starve just by not being able to hold nothing? Sorry I’m freaking out I’m a first time single mom..