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.
Sitzender Junge (Sitting boy) by Werner StÃ¶tzer, 1956. Sitting is a basic human resting position. The body weight is supported primarily by the buttocks in contact with the ground or a horizontal object such as a chair seat. The torso is more or less upright.