When I first got progressives, my doctor made me wear them straight for a week. Since I never wear my glasses, except when I get into bed or if I am very sick (I use contacts with readers), it was horrible. I felt nauseous and dizzy and had to clutch the railings of stairs. But, it went away. If I do wear my progressive outside, it feels slightly weird, but nothing like at first.
Still searching for stylish frames that will fit my puny face and can do progressives. I went to my eye doctor and the person that fits the glasses told me that they don't have any funky frames, since all of the middle aged suburban clients don't want them... I'm an outlier.