Welcome to the forums :) For someone who has been told to keep things to yourself growing up, I'm really glad that you've come here to open up.. I know it isn't easy.
The forums are a safe place for you to share, connect with people going through similar things, and just to let things off your chest and feel heard. We're all here to listen and have a chat when you need it.
I hope you come to know that regardless of whether you think your problems are big/small.. They all matter. Things build up, pile on top of each other and get too much, and it's more than okay if you're struggling because of that. When we have things on our mind deep down and aren't in a good place, seemingly smaller things can set us off.
From what I've read.. What you're going through doesn't sound small to me.
You're a hard worker with a lot on your plate, and you're under a lot of pressure at work, with studies and at home.. It sounds like you're really burnt out and exhausted and lately you haven't been in the headspace to juggle everything. It's near impossible to demand constant high performance when you're under that much stress..
When you're constantly on the go, keeping things together and bottling them up for so long, it seems to catch up to the point where your mind is too exhausted to keep up with simple things.. And in my mind that's more than natural. We can only take so much..
From what you've written, it sounds like things between you and your partner are tense too.. Having blame put solely on you at work rather than the whole team is even more weight to carry.
It sounds like you're second guessing your ability to keep up with your studies.. Do you feel that it's unrealistic with everything going on to balance the two? Is it coming from a place of disappointment where you feel like you're too stressed to cope at the moment, and do you believe it's possible for you to make it work when you're in a better place mentally?
You mentioned that your partner loses her mind over the money your spending.. Would you be comfortable sharing more about that?
Working full time while studying is a huge commitment.. It's amazing that you're doing that and furthering yourself in your career. I asked a few questions but don't feel pressured to answer if you aren't comfortable.. Share as little or as much as you'd like.
I'm here for a chat when you need it and I'd love to learn more about what's going on for you.
I hope you're taking care <3