Hey Iarlai,
I know the feeling. I think most of us get that way. I would say breaks help me the most, but not just a simple walk away. An extended 30min - 1hr walk outside and life experience kind of break. I don't tune out mentally. I will think of the game with concept ideas, or timelines, but just strip yourself from the screen and really allow yourself some sort of reprieve from the strain. My partner frequently wants to go out and do things, which I mostly have to turn down, but she is very motivated in helping me. We will talk through the days to come, or hours, if there is someone willing to lend an ear. I would suggest having a conversation about it with them, again, away from your computer!
Anyway, hope this helps! :)
-Your Fellow GameJammer