Been eating tiny bit or nothing for a little over a week. has my body entered starvation mode if i have nausea for a couple days now?

Possibly: Initially a person uses up glycogen stores from the liver over 48 hours. The body then progresses to utilize protein from muscle and fatty acids. You are much better of resuming eating but concentrate on healthier foods and a healthier lifestyle. Your goal is to change your lifestyle for the better and not to do this type of a crash diet.