Could dysautonomia cause weakness and upper body discomfort, followed by sinus tach up to 170 not relieved quickly by lying down, and vomiting? cardiac echo, ekg normal and arteries scanned.

Not all symptoms: Although dysautonomia can cause tachycardia it usually does not cause the weakness and upper body discomfort described (although the tachycardia could). However i believe the best answer is to have a cardiologist evaluate you for possible arrhythmia disorder (possibly by use of a holter monitor). Its always better to be safe then sorry.

Yes: Dysautonomia is a general term that refers to a group of conditions characterized by abnormal function of the autonomic nervous system. It can affect multiple different organ systems. Common symptoms include dizziness, weakness, fainting, fatigue, nausea, vomiting, diarrhea, constipation, cold hands and feet, abnormal sweating, fast heart rates, slow heart rates, and others. Info at www.Dinet.Org.

A possibility is : Dehydration causing a worsening of your dysautonomia condition. Are you diagnosed with dysautonomia? If not severe dehydration from vomiting and not drinking and eating well can give you all symptoms you are having. Can you tolerate clear liquid diet like gatorade, clear chicken broth, sprite? If not see a physician asap. If cardiac studies like echo and ECG neg the heart may be ok.