I have been diagnosed with Parkinsons idiopathic but also referred to as parkinsonism which I am told is an "umbrella " type term for all types of PD.
I was in my late 40's when diagnosed and as such the risk of getting secondry dystonia is higher than older newly diagnosed folks. Dystonia is the cramping of the feet especially, my toes curl under when it hits my feet turn outwards and it is too painful to keep my shoes on. hands also without notice take on weird shapes without warning. Tremor is part of PD for some.
I was told when sitting keep feet firmly on the floor, pushing heels down, if dystonia strikes press down harder it works for me most of the time.
The PDUK site has a helpline, if still worried/unsure/etc give them a call.
All the best and take care