Sorry to hear you hit a major roadblock over the weekend - that is never a nice thing to happen, especially when you're already feeling low.
It's quite difficult to give advice as I think each person has different coping mechanisms and deal with times like these in a different way. Personally, I would try and give myself as much space as I could to think and allow myself to feel whatever it is I'm feeling, not try and supress the feelings / guilt myself into thinking it's wrong and, if anyone asked me how I was doing on a one-on-one basis, try and at least be as honest as I can with them that, you know what, things are pretty shit. It may lead to a bigger conversation where they're prepared to listen, it may not... but especially in a work-based environment I've found that this kind of approach can be useful, especially in building some level of understanding from colleagues.
Whatever you ended up doing today, I hope you manage to get through the day without things snowballing and getting any worse, and I hope the personal situation can be resolved / righted in some way soon. Easier said than done, I know.
Take care, be kind to yourself.