WILDing is different for everyone. I for example, do not ever feel any spinning. Also, my vibrations are more of a flow through my body instead of actual vibrations. But for you... I think this is a middle phase of a succesful WILD. Wait for all of this to pass and remain calm. Let your thoughts take over. Do not try to control anything. Stay fully relaxed and watch as you see images. Make sure you're reminding yourself of what you're doing. Then hopefully, sooner or later, you'll fall into one of your images and be in a full lucid dream.