Welcome to the forum and to the Parkinson's UK community. This is the perfect place to share your thoughts and feelings with lovely and supportive people who understand what you're going through. I'm sure that, as LEXI255 said, others here have gone through a similar experience and can offer you some support and advice.
It does sound like you've had a rough time, so I just wanted to remind you that you can always ring our helpline on 0808 800 0303 (open 9am-7pm from Monday to Friday and 10am-2pm on Saturdays) for emotional support and guidance on any practical aspect of living with Parkinson's, including employment issues.
You might find some helpful information on this section: http://www.parkinsons.org.uk/content/working-when-you-have-parkinsons There you'll find what level of support you should expect from you employer and plenty of other useful things, but please, don't hesitate to give our helpline a call to chat to our advisers about these issues or any other worries you may have.