Dysautonomy is a collection of complaints concerning the autonomic nervous system. It is a disturbance between the sympathetic and the parasympathetic nervous system. The balance is gone. Because of that complaints like dizziness, fainting, instable blood pressure (extreme high and low peaks), tachycardia (very high heart rate), bradycardia (very low heart rate), gastro paresis (paralysation of the stomach) and a lot more can occur.
Both POTS and OI are forms of dysautonomy. There is no cure for the different types of dysautonomy. But it is possible, by changing your way of life, your diet and your medication, to try to enlighten some of the complaints. However, for each patient the treatment is different and there are no cut and dried solutions. Forms of dysautonomy are generally strongly invalidating. Recently it came out that a small percentage of the people suffering from dysautonomy, have severe neck problems like cranio cervical instability (CCI) and atlas axial instability (AAI).