I've been pretty down too.
I lost my mum in August due to a short but harrowing battle with cancer and I'm just over 6 months pregnant.
My Maternity cover teacher is shadowing me from the start of term to September and it's putting me under pressure to be super organised and micro explain everything that I think, say and do, as well as keep on top of all my records, marking etc (which is probably a good thing)
I plan for and manage 3 year groups and have 3 TAs to manage too (who are lovely btw)
I'm just stressed and exhausted due to insomnia.
There are so many straws that break my the camel's back each day, I'm oversensitive.
The bursar is in an office on her own all day so loves to stir things up in the staff room, making more of things than is necessary. For example she is currently insinuating that my new reception year group's parents are too clingy and that I've somehow encouraged this by allowing the transition to be gentle 
Any form of criticism atm just tips me over because I'm currently going into my reserves in order to just function.
I'm so lucky that I adore the children and all the funny things they say, but somedays the parents and shit stirring staff can just eff off go away!