Is jerking and twitching in the head, arms, legs, and feet associated with anxiety? uncontrollable head movement, head rushes, feeling lightheaded, and none of the head twitching is noticable to any1 but myself.

I'm a 17 year old female, and my only stress was worrying about my health. i just had a check up, doc said im health. but then i started all this twitching. recently my bf got locked up, not the twitching seems worse or at least i pay more attention to it! it happens more when i pay attention too it. its not noticeable to other, but i feel it, like ill be sitting here, and my head will make a little "jerk" to the side, not to bad though. is this anxiety? im worried. i thought it was a brain tumor, or MS! :( i am a hypochondriac too!