I was put on a probation period as all staff new to this hell hole were. it was the most awful school I have ever set foot in.
The students on the whole were unpleasant, and some were vile, but it was the workplace bullying and constant undermining and 'surveillance' from a 'pack' of staff (with 2 being the most consistently dreadful), that I was subjected to from day 1 that was by far the worse.
I suffered with stress, and was constantly ill (including tachycardia and palpitations) and having to take off several days at once. I eventually plucked up the courage to tell my Doctor everything, and he signed me off for a while.
A supply agency offered me a fantastic long term position whilst I was on my leave, and I had already decided I could never set foot in that place ever again anyway. I didn't even check the terms of my probation, I just wrote a letter of resignation and sent it to the Head by recorded delivery, along with my keys. I kept the letter as civil and professional as possible, and kept on referring to my bad health rather than what caused my bad health. I hated myself for not being completely honest, but I didn't want to really piss of the Head and have him send me a rude letter in response - I wouldn't have been able to cope at that time.
Check your probation/contract documents to find out about the notice periods, as I don't know if they are all generic. One of my arguments with probation periods is that they state they can get rid of you any time they like, but that the Teacher is supposed to still give notice. Or you could be like me, and be so incredibly desperate that it makes you act out of character and not give a fuck. I understand if others can't or won't though, I never ever thought I would either.
I got quite an amicable letter from the Head and that was the end of that chapter. I did the supply position shortly after and it completely revitalised me as a person and as a professional. I was respected and valued and listened to, and whilst there, I managed to gain a promotion at another amazing school for after my supply contract had ended.
I hope you are in good health op, and that things do not get you down too much, if that's why you posted the question - I have been rather presumptuous! It was therapeutic writing all that down.