Dear Dr Jonny,
Do you have letters after your name. If not you should have. In a few short sentances you have hit the nail right on the head. First thought on diagnosis was that's my life down the tubes. Settled down after a week or so and sought help. Have never needed councelling in my life before.
Parkinson's?.......It will not ruin my life.
Focus......do what I can when I can. Don't stop because of it. Try it, do it, if not adjust it.
It takes time to adjust and frustartion is cured by a damn good curse when I hit my thumb with the hammer.
One thing I would say to everyone is there are people out there who will help with the hammer. Seek them out.