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There are many causes for irregular periods such as high cholesterol, hormonal imbalance, highly stressful life, chain smoking, and dramatic changes in life style. Other important causes of irregular periods are polycystic disease of the ovary or PCOS and fibroid uterus. PCOS and fibroids have been ruled out in your case by ultrasound.
Severe anemia too is a cause for irregular periods along with nausea, dizziness and blackouts. A complete blood count, hormonal panel and lipid profile should be done to reach the cause of irregular periods.
Emotional outbursts can be a side effect of the pills you are taking. Progesterone only pills may be helpful but before taking them the cause behind irregular periods should be found out.
Since a confirmed diagnosis cannot be given on net please discuss these possibilities with your doctor once. Hope this helps. Take care!
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