Hi Susan…autonomic dysfunction can occur as a symptom of Parkinson’s Disease, can pre-date the onset of Parkinson’s or can be a stand-alone illness. I have been diagnosed with Pure Autonomic Failure without Supine Hypertension. My BP does not go up when I lie down to sleep but my BP is very very low without an increase in my heart rate during the daytime hours predisposing me to dizziness and fainting. If you have not yet, please discuss this with your Parkinson’s Neurologist as well as your Primary Care Doctor. My best treatment has been at Vanderbilt University Autonomic Dysfunction Center in Nashville, TN. (615) 322-2318 There may be a center closer to your home…your doctors should be able to guide you. I have participated in several research studies conducted by Vanderbilt’s Drs. Okamoto and Biaggionni. You may want to google their names and take a look at some of their publications. Hope this was helpful.