In reply to flopsicle:
No, can't tell you what that is and to be honest, I wouldn't really trust anyone who says they can unless they're a medical professional with access to your records.
That said, something from my own experience. In the space of six days, many years ago, I went from leading an HVS 5b one sunny April Saturday to being unable to hold a pen and write six days later. Five or six weeks later, back as it was. Turned out that was the first major sign of MS.
Which isn't to say that's what you have. If you've had the scans and the EEG and seen the neurologist, they should have picked up any nerve plaque signals. Should have but, and this is an important but, those plaques might not have fully formed or may, just because life is like this, might not have been picked up this time.
So go back to your GP, listen to what they say and do what you're told. Fingers crossed for that there's another cause and that stuff gets sorted for you.
However, if something else equally strange starts to happen - for me it was my left eye not moving left of centre, which gave me lots of headaches and took me a few weeks to work out, but it could be something like your right leg not working the way it should do causing trips and falls or any of umpteen other strange things - get back to your GP and start pressing them for more scans.
I hope it doesn't work out like that obviously, but what you posted rang an alarm bell.
T.