It helped seeing an autonomic specialist who was able to convince me that there is NO perminent damage to my nerves, including autonomic nerves. He spent a long time talking to me, reassuring me by various evidence that in fact there is no perminent damage. He tested both sympathetic and parasympathetic nerve groups and was able to get normal responses, if a bit fast or a bit slow, still normal. I CAN function normally, my nerves ARE there after all, I just might need to change a few things or avoid overstressing my system. great to hear this is helping you! i also have the dizziness and tachy but never faint. im going to try and slow down my breathing. just a few questions for you. did you get visible blood pooling in feet and legs? and how did they test the autonomic nerves, para and sympathetic? thanks so much!