Weird Question

On your period, do you ever feel the lips of your vagina swollen? Ok so its not actually swollen but feel like the vaginal lips are filled with sand bags....i know, right, weird.... it started in my mid twenties and I'm 29 now... not sure if age matters. but Dr never seems to know what I'm talking about. but when it happens i can't even stand long because it feels like gravity is pulling these 2 sand bag lips to the ground lol.... although it looks totally normal down there. any ideas????