Parkinson's Disease Support Group
Parkinson's disease is a movement disorder often characterized by muscle rigidity, tremor, a slowing of physical movement, and in extreme cases, a loss of physical movement. The primary symptoms of Parkinsons are due to excessive muscle contraction, normally caused by the insufficient formation and action of dopamine, which is produced in the dopaminergic neurons of the...


Are you sure your leg wasn't dyskinesia? I haven't heard of it being limited to one limb, but with diseases of the brain, things can be possible.
Are you seeing a Movement Disorder Specialist? Who provided all your diagnoses?
Even if you aren't seeing a MDS, I can recommend that you print this out and take it with you to your next neuro/doctor appointment:
https://davisphinneyfoundation.org/wp-content/uploads/dlm_uploads/2020/08/EVC-2019-WS-My_Symptoms-2.pdf
DAT scans are not definitive for diagnosing, and not always covered by insurance, and are very expensive.
I hope this helps a little.