Ok , trying a second time.

What if:

Your neurons are damaged not dead.
Sinemet was helping.
These are the signs of PD.

OR

What if:

Your neurons are fine.
Sinemet was giving you side effects that look like PD
You are having withdrawal symptoms.

Then either your brain is in starve mode or in crave mode.

Medicine does not know much about this.
Only those who have done what you are doing actually know.

So what is your gut instinct about it?
All your options are binary here, so it is your call.