I am currently in the early onset Parkinson's fear as well. I also went from M.S., to ALS, to Parkinson's. I have experienced all the key symptoms of Parkinson's (even the very strange sleeping paterns), but the neurologist did not seem to be to worried. If you are familiar with anxiety, it is much more likely to have caused your trouble. You were probably perfectly healthy before your obsession started. For me I discovered the disease Parkinson's and strated living it. After reading about it I saw every single symptom in myself. Now my obsession is relatively under control, the only thing that keeps bothering me is my sleeping paralysis (which is more likely caused by a chronic lack of sleep). Try not to pay to much attention to your body. Parkinson's is not the worse disease around (Believe me, I have really read it) and the fear is worse than the first 10 years of onset. Besides, a cure is close. By the time you develop real Parkinson's, it is very likely there will be a cure (Believe me, I have also read this). They are currently able to stop the mental impairement of Parkinson's in mice, and the fysical impairement is managable trough exercise and diet. Please stop worrying, the worry is worse than the disease. If you really want certainty, you can ask for a dat-spect scan. This scan shows anomalies in the part of the brain that is effected by Parkinson's.