I m 40 weeks pregnant I felt like I was going to vomit so I ate then I got light headed but I ve been drinking water and the baby has been moving but I m worried because yesterday I was 2and a half cm.s dialated... could this be labor or is this normal?
Yes this is labor pains, sometimes cervical dilation can cause vomiting.  Rush to your gynecologist for delivery, before any complications arises. All the best.