All this is quite difficult about what is wrong or right. I work in health, and have had several referrals to occy health - none of which amounted to much and frankly not a great deal of help to me or hinderance.
I guess working in education you may qualify for ill health retirement, but a long way down the road.
I have found talking to employer and occy health in an honest way helps - as in "i am fine at the moment, may need some minor changes, but of course things will change, and you'll be the first to know". Also there are good and bad days, and its important that they understand the bad days may be few and far between at the moment! be positive.
Remember that your occy health may not be totaly aware of PD - but hopefully are, so you may need to guide them.
Work for me, is the biggest stress - this disease can be so unpridictable in its progression that planning is so difficult - yet we all know that more than likely it will eventually effect our work.
I must admit i start to feel my movement is being observed, and it knocks me, but head down and soldier on!! I fell in the car park last week - pd? or curb or both?, and bearing in mind I work in a hospital, no one came to my rescue.................I think my swearing scared them off!!
Good luck, be posititive, and maybe talk to union if you are in one, or find out your basic rights.