Hi Radioguy,
I have had PD for around 16 years now. In the years up to the 10th year, I was not bothered with dyskinesia. However, it became more of a problem in the subsequent years, 10 to 16, and now I get it with every dose of sinemet. It is a side effect of the levodopa, not a disease in its own right.
The only way to stop it is to cut down your sinemet, if you can cope with this. It generally makes me unable to write, or do any intricate work, and usually occurs at the peak levodopa concentration in the blood.
A strange thing I experience, is every time I sit down for a meal, as soon as I start eating, I get very bad dyskinesia. I have asked the forum whether anyone else gets this, but no confirmation.
I used to take Amantadine to calm down the movement, and it definitely helps. However I am on a new doc now, who has changed my meds, and cut out amantadine. and I am getting less dyskinesia now, but it is still a problem,
Hope this helps
Ron