My client has PD and she is doing PT twice a week. Normally, she doesn't tremor at all, but lately, after PT she does quite severely for a while. But her PD doc wants her as active as possible so the PT continues. She is 76 and starting to really slow down, so the PT is important to just maintain what mobility she has. I think you shoudl just ask your doctor. It is unusual for doctor to ever say "don't exercise". Does the tremoring get better after a bit? I think releasing endorphins has something to do with it.