I just signed up for the service. I have been diagnosed as having Parkinson's and a slight heart rhythm problem. Doctors don't seem to think that they are related. Last week I had a blackout. Fell to the floor, but no dizziness, no remembrance of a fall. Just standing one second, lying on the floor the next. I don't know whether it's PD, Sinemet, Artane, or the slight heart problem. I know light headedness is a problem, but I don't think that was what it was. Any ideas?