Tremulousness, sometimes called internal tremor, vibrations or shaking, has long been recognized as a symptom of elevated sympathetic nervous system tone (a hyperadrnergic state), and it's often seen in POTS. Many people MS and Vibrating Sensations: What Do They Mean? MyMSTeam Vulvodynia Treatment #1 Pelvic Pain Surgeon AZ What do pelvic floor spasms feel like? Tips + Exercises to Help Buy Tracy's Dog OG PRO 2 Clitoral Sucking Vibrator With Pleasure Air