Should I go to the hospital?

I am a 16 year old female,
For the past two days I have been feeling pretty sick..
Ive been vomiting up any food that I eat, also can’t keep water down. I have developed a weird rash on my stomach that’s spread to my upper legs. It looks like spots ( without white or black heads, obviously ) and it covers all around my belly button, my hips, lower stomach and upper legs. I feel quite dizzy when I move in any way at all, even just turning over in bed.
I get really hot at night and wake up covered in sweat. Then I’ll get cold and it would carry on like that for the day.
Its defiantly not the flu or a cold because I’ve grown up getting both of them a few times a month ( poor immune system )
Please tell me if I should go