Hi Mandyy, WELCOME to the forum!
As far as staying on the program, get yourself through the first three days. After that, you will notice that you have more energy, and you feel better. Dizziness or headaches are usually temporary. For dizziness, try some bouillon. Just means that your sodium and pottasium, etc. are abit on the low side, plus your body is adjusting to fewer calories and getting ready to burn fat.
Keep reading your Quick Start booklet, over and over and keep viewing and posting on this forum, where you will get all the support and good advice that you will ever need to succeed. Set short range mini goals for yourself. Once you see the pounds dropping off, you will, most likely want to continue.
Try eating your MF supplements every two-three hours during the day so that you won't be hungry. Have a fast soup if you feel that you cannot wait until dinner, or some other snack allowed on the program. Only one snack per day, though. One bar per day is nice to look forward to, but not for the first or for your last meal.
Look at the Studio section pictures of our wonderful and successful weight losers. This can be you, also. This is my inspiration as well as some wonderful, kind, friendly, successful, informative, bright, funny, charming, and I could go on and on---members of this forum!!!

Please commit to the program for one week and see how you feel, then. It can be overwhelming--just take one step at a time. Success is there for the taking!!!
Joan