This is what happens when you start and stop the pill quickly, it is normal.
Side effects like that generally go away in 2-3 weeks-2 months, so you need to give your body time to adjust. The pain, nausea, and mood swings of pregnancy are farrrr worse than any associated with birth control.
I have been pregnant 3 times, I should know...
Nuva ring is excellent, it dos not cause the nausea, and mood swings are kept to a minimum...