Finished tactics unit 30 (module 1)

I just finished tactics unit 30 of tactics module 1. Mostly 4 move mate problems again, but this time around they were less frustrating. Even though exhaustion is getting the better of me. I've got a lot of sh*t on my mind which is taking it's toll. And it is hard to combine that with something as excruciating as studying chess. It is getting harder and harder to solve problems and to 'not' play sh*tty games. The past couple of days i've been on a serious blunder streak in my turn-based games (whoever thought a serious blunder was possible in a turn-based game?), and my live games aren't going much better either! I just sit there in front of that screen, and i just don't see anything anymore. I think i see it, but i don't. And it's pretty hard to deal with the frustration that goes along with it...