Hi Samantha,
Just done a very detailed reply but lost it, so only have time for a short reply.
To me, it sounds more like PD than not. One sided symptoms, difficulty turning, etc. More tests you could do are take a 100mg Sinemet, see if there is any reduction in symptoms, it is a vote for PD. Get a friend to wind your arm around in a large circle, while you completely relax. If she detects rigidity at a point in the circle, it is called "clockwork rigidity" and is likely to be PD.
Good luck
Ron