Would it help if you took the seroquel before you went to sleep at night? Artificial sweetners like the one in Diet Coke are rumored to sabotage weight loss; if you're not satisfied with straight water, you could try making unsweetened ice tea; if there's a Japanese or Korean foods store near you, try making roasted barley tea, which steeps in the refrigerator. Someday they'll discover that Fukushima contaminated all the barley fields and we'll all pay a dear price for our roasted barley tea, but in the meantime, it's a delicious zero-calorie alternative to Diet Coke.