I work in a nursery school and so know the full-on nature of the job you are involved in, 100% attention demanded at all times!! I don't have PD but was a carer for my mother who had PD for 10 years. Your diagnosis was only at the end of last term and so you have had a lot to deal with in coming to terms with that since then. I know what the busy first days of term are like. With lots also going on in your head, dealing with a PD diagnosis and not having seen the neuro yet - you have a lot on your plate right now....you must be on an emotional roller-coaster. The suggestion to link with other young onset PD is a good one.
Being tired is part of PD and beginning of term is tiring for those without PD! .....I don't know where you are with medication or medical support and all of that will play havoc with emotions too. Have you been able to share your diagnosis with your work colleagues?
When things were tough as a carer, It was hard in the classroom - but the children were also a real boost and sometimes such a mood lifter!!
Good luck and hope that being on this site is helpful as is the rest of the PUK website with information and support...