“眩晕的”用英语怎么说？

我们正以令人眩晕的速度下降。We're descending now at dizzying speed.物价以令人眩晕的速度不断上涨.Prices keep rising at a dizzy rate.她愈来愈糊涂, 她那眩晕的头脑简直弄不明白.She grew more and more bewildered, and her dizzy head refused to reason....