Women with more severe cases of prolonged and continuous periods may want to consider pharmaceutical options. In cases of hormonal imbalance, most doctors prescribe oral contraception or any hormonal therapy to regulate the menstrual cycle and balance your hormone levels.
The bone that you sit on is also known as the sits bones. The  scientific name is the ischium which is a large swelling  posteriorly on the superior ramus of the ischium.
Fun/Misc. -------. Ischial-Tuberosity (Sitz bones; Tuberosity of the Ischium) by Swami Jnaneshvara Bharati Homepage. In sitting for meditation, what is most important, as Patanjali says in Yoga Sutras, is that the posture be sthira (steady, stable, motionless) and sukham (comfortable, ease filled) (Yoga Sutra 2.46).n addition, one should sit so that the body weight is resting on the two bones known as Tuberocity of the Ischium or the Isahial Tuberosity, which are also known as the Sitz bones.