Hello.. i have been experiencing internal vibrations when I'm relaxing or trying to sleep. It is somewhat like shivering. I have just got off a course of birth control pills a week back. These internal vibrations started about a month ago..back then it was mainly in my lower body. Now I can experience it in my torso as well. I also experience twitches throughout the day behind my knees and intermittent muscle pain as well. Please give an input.