This sets out what is going on, BB.
It seems it can be caused by peaks in Levadopa...when you are on..ll
or when meds wear off before next dose..
or as a general feature of Parkinsons.
As it has come on suddenly with the change of meds it would seem related to your new med regime.
Smoothing out the levels of Levadopa might well help.
Entacapone can't be tolerated by some patients but worth a try, and there is Stalevo which is Sinemet and Entacapone combined.
Rytary , if we ever get it, is aimed at keeping levels constant.
For now, we have settled on the every 2 hours lower dose regime and despite the inconvenience it is fine.
Keep your chin up and keep trying to find a way through.