Need help passing the 3 hr glucose test

I'm nervous as hell for this test tomorrow. Why you ask? Bc you have to fast and I have to wake up at 6:30 to get my daughter ready for school. Then my appt is at 8. I won't be able to eat anything until after 11. Now for those who don't have a problem not eating in the morning, you might not truly understand. But for those who are like me and have to eat something right when waking up to avoid vomiting, you'll get it. You know when your stomach nags you bc it's hungry? Normally you can ignore that for a little while. Me? Nope, I cant. Bc my hunger pains make me nauseaous, and I don't mean, they make me feel a little sick but can handle it. I mean, if I don't eat when I first wake up, or anytime I feel the hunger, I will throw up. This morning I woke up earlier than I usually do. So I thought I'd see how long I could go without eat. Yea I made it all of 20 mins, vomited in the shower. :( what's going to happen if I don't get through this test? If I throw up they'll make me come back and do it again. :/ idk how to get through this.