Phallic and vaginal imagery in dreams generally is symbolic of a desire to eat a pancake. A lot of people make the mistake of assuming that a penis is in some way sexual. It is not. A vagina? Even less sexual than a penis. A vagina is just the female equivalent of the male pocket. It is a place to keep car keys and receipts.
Feeling trembly is totally normal when you are being shaken as violently as I am shaking you at the moment. It is a concern that you have only just noticed.
Tell me, what are your relationships with authority figures like?