Oldun, ( but 69 is not OLD!)
Sinemet CR is a slow release version of Sinemet. Some neurologists feel that the levodopa uptake is somewhat haphazard, not as dependable as when taking ordinary Sinemet and prescribe it mainly for night time use . Do your symptoms bother you, affect your quality of life? I am asking this because you have been taking this medication for two years now with no relief from symptoms. Surely, there must have been a follow-up at some time to see how well the drug worked? Like Gus said there is no reason to take it if it doesn't have the desired effect. It should be increased or another drug should be tried.
You would probably feel a clearer "hit" (I do) if you took the ordinary Sinemet version, because this is quick (within 30 minutes in my case on an empty stomach) and short working (again, in my case 2-3 hours max.).