Hi,
I was diagnosed at the age of 30. I am now 59. If the sinemet is not having any effect I would consider asking your Movement Disorder Specialist if he would consider ordering a DAT scan. Look for the question "How is Parkinson's disease diagnosed?" on the link below.
https://www.michaeljfox.org/understa...e-got-what.php
The scan can confirm your diagnosis, or rule it out. But it not considered a Diagnosis tool. If you are on such a high dose so soon, and Sinemet isn't helping, I would want to be darn sure I need the medication. Dyskinesia is a side effect of Sinemet. Make sure your Kidneys are healthy as they can shut down if your dyskinsia is too active. Happened to me. One minute I was writhing on living room floor then Next neniry I was in Intensive care just waking up from a 3 day coma.
Sinemet is a heavy duty medicine. There are many here who work on treating their disease holisticly by diet, exercise qnd food additives.
All my best,
Dianna