How do you deal with being nervous for a presentation?

I don't just mean like "erflies in your stomach nurvous" I mean full on you chest is burning, you blank out, you feel a but queasy even though your stomach doesn't hurt, nurvous. I'm the first one up which helps a bit, but this is my 2nd last cl and it's tomorrow. It's only in front of a like 20 kids cause our cl is small, and all we have to do it state 5 facts about our project(which I will write down and just read aloud to make it easy make it eaiser for myself), but I phyic myself out. I'll think I can do it but then I walk in the cl and all confidence is lost. I don't have any close friend in this cl which doesn't help .I'm nearly having a panic attack right now just thinking about it. Please help!