Please know that I am not a doctor.
But I am a woman who has had ovarian cysts and I know from experience that they can cause nausea, pain, and dizziness. If you have concerns I would get a second opinion. If an ultrasound was not done I am not sure how the doctor could rule out an ovarian cyst.
You may want to read my article on ovarian cysts to check out the possible symptoms.
The bottom line is if you think something is not right it is better to be persistent and get things checked out.
Thank you for your question.
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