What Causes Burning Sensation On The Chest, Arms And Inner Thighs?

Good afternoon, my wife is experiencing internal vibration, like swallowing a cell phone, and it vibrates 24/7 for the last week. She is also experiencing a sunburn affect on her chest ,arms, inner thighs. it s a burning sensation with no visible rash. The vibration will not allow her to eat or sleep because it is disruptive. She has been to er and had extensive blood work with no problems, even thyroid was checked, Appreciate any help. Thank you