Wobbly,
Stick with it, don't give in.
Try drinking lots of water to curb your hunger, and if needs be have a pack/tetra earlier than you normally would.
Day 1-3 are definitely the hardest, and week one is the one you need to get through but if you do you'll be sooo happy with the results that it'll spur you on more than ever.
If you continue to feel lightheaded though maybe try contacting your CDC for advice.
Good Luck