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Irregularities in menstrual cycles, prolonged and repeated heavy vaginal bleeding could suggest underlying problems like hormonal imbalances, thyroid hormone abnormality, anemia, bleeding disorder, vitamin deficiency, ovarian or endometrial problems etc. The exact cause can only be made out after careful evaluation (complete blood & hormonal work-up, ultrasound scan etc). Consider visiting your doctor/gynecologist at the earliest for thorough examination and further evaluation to look for the underlying cause for the abnormal bleeding that you describe. You may also consider taking second opinion from another gynecologist. Treatment as appropriate (based on examination findings and investigations results) would be started to help you control the bleeding and regulate your periods. Consider being in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.