I hope all is well.
You mentioned that you’ve already had advice from the union which is great, however, it might be worth checking out our Work and Parkinson’s page on the Parkinson’s UK website. It has a lot of information including useful contacts of organisations that provide advice for employees affected by Parkinson’s as well as information to help you make informed decisions about your working life.
As suggested by one of our moderators, please feel free to contact our helpline service on 0808 800 0303 and speak to one of advisers about your situation in more detail.
I hope you find the information above useful.