Maybe as your brain is a component of your body getting your body tired gets your brain too tired to obsess too much. Since taking on my current role involves a lot of travel and planning I don’t have enough time or energy to ruminate too deeply on my domestic situation so I actually have a more positive outlook these days. Try sneaking more physical activity into your work day and see if that tires you physically enough to get a good evening in. Just taking the stairs where possible could make the difference.