It would be easy for me to comment something like "you got this" or "keep pushing," but that's impersonal and insensitive. Tiredness/fatigue is so damn real and when it comes to little projects/tasks, the effects are especially draining--mentally and physically. My suggestion is to take a day off. A full day of doing whatever it is you would rather be doing. Get to the gym, go for a hike, lay in bed all day, etc. etc. Give yourself some much needed relaxation and distress time. I don't know how far you are into the process, so maybe that's not a viable option. If a full day isn't plausible, take 4 hours of a day even. I have been put in very similar positions as this, especially during finals week. Sleep. Destress. Recuperate. Begin again.
the main thing is to believe everything will turn out)) thank you for the Soviets dear)))