Been at work for two hours and I've been getting dizzy as crap. Worked register for an hour of it…

Been at work for two hours and I've been getting dizzy as crap. Worked register for an hour of it and had multiple people ask me if I am okay because they notice I'm not feeling good and I'm being wobbly. We aren't busy at all so I don't know what's going on. I'm being sent home and husband wants to know if I want to go in and get looked at when I know they are going to tell me I'm dehydrated because I can't keep anything down. I was having a lot of chest,back ,and stomach pain before I came to work and my back is still killing me.