http://www.nwpf.org/wellness/Physica...dications.aspx
you've got a dopamine deficiency. eventually we all need more dopamine or a dopamine analog. sinemet has been around for 30 years or more. you may feel a major improvement after the first dose but regardless, there's no danger in trying it for a week and then discontinuing it . at least you'd have peace of mind that it's effective if you absolutely need something in the future.
pd is a chronic illness and whether you are taking "natural" supplements or a synthetic drug there are going to be side affects. dopamine in sinemet is synthesized but is a simple amino acid. unfortunately when your brain doesn't make enough just like when your pancreas doesn't make enough insulin you have to take an external source and the challenge is getting the right amount in the bloodstream and even then the neurons in the brain don't always need the same amount of dopamine it seems.
getting ahead of myself here. in my opinion, no big deal to try sinemet, bigger commitment to try an agonist.
bigger question, do you have insurance and seeing a doctor? did you get a 2nd opinion?