I would be taking yourself & the oil to your Dr & asking. While Sarah is right about itching being a sign of something more evil, the fact this happened after using the oil & in the area's you applied makes me think its a reaction to the oil.
I would find out if its safe to take a anti histmine(sp?) to easy the itching. but yeah take yourself & the product to your dr, chemist or Ob/midwife & find out what you can do.