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High FIVE!
Okay, moving on. It sounds to me like you're getting mentally exhausted. The thing with that is, mental exhaustion is like physical exhaustion. If you run and run or do anything physically taxing, of course your body is gonna feel extremely fatigued. The same goes for your mental state. It's not going to be great pushing yourself so much if it leads to a downward spiral and making yourself feel like crap.
First of all, I'm not saying this thing you're experiencing is bad. A lot of people have experienced what you have. I have too. The difference comes when you learn how to handle it. For me, I stop. If something isn't working, I stop and think about it. Is it because deep down I know that a certain scene just doesn't go well with the story? Is it because it clashes with certain character traits? Is it because my writing is not up to par and I can't describe it like I want to? If my writing is subpar, can I find different ways to write it that can reach the same effect I wanted?
OR, is something in real life messing with my head and I have to think about that first?
It could be anything really. The best way I usually get out of that is to whip out my favorite novels. Read favorite parts or even the whole book altogether. I watch my favorite anime, movie, youtube vid(s), and I feel my endorphins giving me a push to do more happy things. Sometimes, I listen to my "angry playlist that makes me feel hella good" and all is well with the world again.
The only advice I can really give you is to not feel like crap about what you're feeling. Take some time to breathe and appreciate the stuff you already wrote. Remember why you love your story and why you want to write it in the first place. Maybe then you'll feel better and have a go at writing more.