For the last year, I have been working on my thesis in the area of mathematical physics. It's been a long project with many challenges and hurdles and progress has been slow. At the same time, I have managed to be in a stable long term romantic relationship with whom I cohabit, and spend a significant chunk of my time. In the light of that, I have kept my work time and personal time separate. I try, as much, not to think about work off work hours, and I am decently successful at it.
Now, the issue I have is with my mood. When I have a great day at work, and problems get solved- I am ecstatic and fun to be with. But on days when things don't work, I am not a great person to hang around. I am silent, and worry too much. Almost always, the problem solves itself in the next few days, or even sometimes after a good sleep. I know this; I know that I will manage, yet I somehow can't make myself feel good on days like these, and in research- I have a lot of such days. I wonder if anyone else has experienced the same, and if so, how do you deal with it? I feel like this is in general very important for my well-being if I remain in research.