MElaine- the headaches are normal, I think pretty much everyone has experienced them when doing TO (take off). They will go away, don't worry!
You'll be back to eatting foodssuch as proteins (chicken, beef, fish, etc.), veggies, fruits, dairy, etc tomorrow, so hang in there! I don't know what plan they'll put you on, but don't worry, you'll do great.
Just keep thinking about how you'll feel tomorrow after you get weighed in! It's the most amazing feeling after your first 2 days! I personaly lost 8lbs. It's AWESOME!