How long will this hangover last?

I didn't plan on it but I drank waaay too much last night. I don't know if it is necessarily a hangover. I don't have a headache but I can't stop throwing up and it's making me so weak. I'm slowly sipping on water and eating crackers but I just keep throwing them up. I hate the way I am feeling right now and I just want it to end. can anyone help put a time frame on this hellish experience?