I know exactly that feeling! I'm sitting here, dreading tomorrow.
I started a new job about 8 weeks ago. All seemed well at first but then the cracks started to show. The woman who's job I'm supposed to be taking over when she goes off on mat leave is only 24 and has never trained anyone before. There is a bit of a language problem also. Then there's the fact that I learnt after the first week, I was supposed to be learning 2 other jobs also. It's very involved work and each of the jobs is quite different (all admin though). It got so that when I asked for help as I didn't understand/hadn't done/ had forgotten something, I either got told 'in a minute' in a short sharp reply (and then it didn't happen) and latterly, sighs and eye rolls. I feel like a complete nuisance and rather thick - but they have expected me to have an afternoon observing a task and then expected to remember it three weeks later! And, yes, I did take as many notes as I could but there are so many variables i.e. 'you do it like this except when this happens or this or this'. I've been constantly coming up with things I haven't come across. Also I've been told 'you've done that wrong, you do it like this'. I correct it but have said 'oh, I've not seen that before' to be told, in error, 'yes you have, we went through this'!
I'd speak to the line manager about it but she really doesn't care what the minions do, as long as the jobs get done. She will also ball people out in the office if they've done something wrong.
I understand everyone is stressed and has too much work to do but......
I've already pulled sick days (in my probation period - not good) because I'm so stressed about the whole situation. Almost hope they contact me later today and dismiss me but I can't afford it. My mental health has taken a huge hit. Even had nightmares about it all last night.
I've been on Indeed again but I don't know how I'd fit interviews in and how I'd explain my brief time with this company. I have to work or I'll lose my rented house.
Sorry for the tirade op's post struck a cord with me, still in bed, dreading tomorrow.