Every few months I get this intense pain in my stomach. If I lean up or stand straight extending my torso, it feels like there is a string directly hooked from my belly button to my clitoris. The pain is very sharp and very sudden. It feels like someons is yanking on the "string". Once I lean back down doubled over it does not hurt at all, only when fully extending the body. I am confused as to what this could be. Please reply and let me know what you think.