Lavender: 
An effective anti-inflammatory that improves blood flow and can help reduce period cramps, and ease headaches associated with menstruation. 
Sweet majoram:
Contains analgesic properties so is useful for headaches, migraines, swollen joints, and muscular pain. It is also antispasmodic so useful for intestinal cramps, period pain, muscular cramp and IBS. 
Clary sage:
A powerful antispasmodic so useful for cramps, labour pain, period pain, muscular spasms. It is also a hormone balancer so useful for irregular periods, PMS and during menopause 
Roman chamomile:
A great antispasmodic and relaxant so is useful for IBS, muscular spasm, cramp and period pain.