My baby just had projectile vomiting, HELP PLEASE..?

My daughter is 4 months old. For the past 3 days she has been very sweaty and very fussy. Today, she was eating and when I was burping her, all of a sudden damn near the entire bottle was all over the kitchen floor, down my back and all over her. This never happened before. I gave her 2 ounces of pediatlite and I am taking her to the drs tomorrow morning. I just was wondering if this siutation happened to anyone and if so, what happened and how did you handle it? did it get better??