I’m so sorry, I agree with #1 please take some time off if you can. I know it’s like torture trying to go through the motions while you can’t stop thinking about it. If you have to be at work though I think there’s really nothing to do other than try to preoccupy yourself with being super focused on work
give yourself some time off pls. breakups are soooo hard. i can only assume the same for if you were engaged to the person. take some time off. explain the situation and hopefully they’ll understand. after that, you’re still probably gonna feel it but work helps as a distraction but if you need to cry, just go to the bathroom and breakdown there. i’m so sorry you’re going through this