Would Le Citron Grey Goose Vodka make me more sick than original, non-flavoured?

I know that sweetened alcohol makes me sick. Dry, clear liquor does not. For example, the other night I had some malibu peach rum, and also disorono mixed with coke. It tasted great, but it made me nausiaus during and after drinking it. I barely even got drunk. Last night however, following a tip I received from yahoo answers, I tried straight dry clear vodka. I got absolutely hammered but I never felt sick, not during and not even this morning. It's great! but it's very hard to drink straight. So I am hoping to compromise, find some middle ground. I have heard that Grey Goose vodka is good, and I am interested in trying one of the flavoured ones like Le Citron or something. But is is sweetened/ flavoured to the point where it will make me sick like the other night? Or is it lightly flavoured enough that it will affect me like the Absolut Original vodka did last night?