Its natural to be worried and afraid, but DO NOT CANCEL!!!! Your life is going to be so much better. Its very important that you understand that the band is there to help, it will not do it all by itself (drinking milk shakes all day will not be the bands fault). My wife and I both got lapband and we have lost a combined 110lbs. and my health is so much better, im off all my meds except one, but even that was reduced to 25% dosage.
Follow all the instructions they give you, I like to eat bad foods once in a while, but you will find out you can't eat as much, so you still keep your weight down. Its the best decision I have ever made, my doctor says I will live longer because of this procedure. I used to wear 42-44 waist size jeans, and now I wear 33's, I love buying new clothes and so will you. Good Luck.
If you ever need anything let me know.
Ramg66