how long have you been sick? sure it's not a bug? if you weren't sick the first week, it's unlikely it's the hcg that's making your nauseous now. make sure you're not taking any meds or vitamins without food- i was nauseous my entire first round because of this.
unfortunately if you've only been on it a week, it's unlikely you'll keep a lot of weight off. but if you want to try it, i'd stop the drops, continue the vlcd for another 48 hrs, and then transition to P3.
you also might try just decreasing your dose to see if that helps the nausea.