I dreaded not eating for that long too and like you I start to shake and get a headache.

The only think I hated was the chicken broth. yuck. decided I couldn't drink that.

I drank lots of juice ~ Pineapple Orange Banana and White Grape Peach juice. I drank diet Sprite. I hate hard candy (Jolly Ranchers but not red or purple).

I made it just fine. That part was not nearly as bad as I was afraid it would be. I did schedule my test early (8 a.m.) so I could go get it over with early. Do you have someone to drive you and stay with you that day?