I hate this for you! I am so sorry. The beginning of any loss is the worst part of the pain but the good news is that the initial stage is ‘the worst’. It does get better. You know that ; however there is no timeline (although a TV show character had said that it takes about 10K drinks to get over someone [emoji4] )
Can you take few days off work and get away? Go any where that is not your routine. I consider this type of personal problem equivalent to getting sick. I hope you have some sick days to use. Right now, YOU should be your main priority. Not work, not anyone else. Just you attending to your needs.
On the other hand, work could distract you from the stab in your stomach; although that might lead to you repressing your pain, which might delay the recovery process.
I have no idea how you would cope.... I do only one thing in these situations: embrace the pain and the sand dunes in my heart because they aren’t going away. It doesn’t make it easier but it makes it more transparent and real. Meaning, it somehow helps the acceptance process.
I am here if and whenever you want to talk.