Parkinson's has many symptoms .not all people get all the symptoms.

A lot of medical professionals mistake PD early stage symptoms for E. As the tremor is the only symptom of ET, as far as i am aware.

Doctors quite often diagnose as Essential tremors first. a few more tests to rule out a few more things, an then there will be a diagnosis of PD Time elapsed may be a couple of years.

Generally no but anything is possible.

only get tremors if I am very anxious about something out of my control ,, Glad I dont have them on a daily basis