Hi Clemmo and everyone:
So, great news for me, I do not have PD but was diagnosed with the enigmatic 'functional neurological disorder' (FND). The symptoms, however are very similar to PD and MS but they are not caused by organic progressive disease, in fact, they are the result of a wider blip in the autonomic nervous system, much like the PoTS I have already. In a nutshell, the emotional (autonomic) side of the brain cannot communicate effectively to the movement (motor) side, resulting in very real symptoms, just not caused by anything that can be detected (yet).
I have done a little bit of reading and YouTubing, mainly to see what can be done as the consultant wasn't so hot on that if I'm honest apart from giving me an online web resource. These functional disorders have historically come under the umberella of medically unexplained symptoms, so unless people (including health professionals) are in the know, they probably assume they are psychoogenic in origin, but this isn't the case.
One of the explanations given for the cause in my case is my inability to get restorative sleep. If my temporal lobe epilepsy I was diagnosed with when around 13 years old was the start of my narcolepsy (sometimes not easy to tell the TLE from sleep phenomena and REM intrusion into wakefulness) then I have not had good quality sleep for the best part of 30 years. This eventually creates havoc with autonomic functioning as parts of the nervous and motor systems start to become disrupted and eventually symptoms emerge.
I'm satisfied I do not have PD, I had no rigidity on examination and even though my left hand is slower than the right, it is within normal range. My only niggle I have left is from what I have read, people who have lost arm swing as a result of FND, will regain it the second they are distracted but mine is the opposite, the more I have to concentrate on other things, even basic things, it starts doing what it wants.
So, a bit of a wake up call in terms of looking after myself even better in terms of my narcolepsy, although I do everything pretty much by the book and take modafnil (alongside dextroamfetamine occasionally) daily to get me through - all these drugs do is help with wakefulness, the drug I need (sodium oxybate) has been refused by my CCG as cost prohibitive - this drug actually helps with the nighttime sleep and the cataplexy, as it is, I'm just papering over the cracks taking stimulants to keep me going.
Sorry for the long post, lots to think about, in fact, I'd be keen to know what other people think too and thanks once again for you all being there when I was worried. Very much appreciated