I often get those 'attacks' that someone here suggested are called 'autonomic storms.' First i get very tired and sleepy, and then i get freezing cold - so cold that my whole body is trembling violently - my skin goes pale and my veins dissappear, and im FREEZING! The i start to get restless or anxious, and then my heart begins to beat hard for a while. Its basically in this pattern: tired, achy, freezing, trembling, out-of-it/anxious, dizzy, surging feeling in head and heart palps, then strange feeling that lasts for days afterwards/increased orthostatic intolerance. I take betablockers every time i feel it coming on - which usually only is after i have had some alcohol or stress, and it goes away.It freaks out the people i live with because i tremble so much that peopl think im having a fit. When i first got pots, and for a while before, i constantly had cold hands and feet - all the time - annoyingly... Now its gone away as have many of my symptoms after two years of slight symptoms, and one and a half of terrible symptoms - hand tremors, vitreous floaters, dizzy and tired after meals, weak, pale, heart racing, dizziness, spaced out and out of it, etc...