What helped my colleague and close friend to get through her workday after sad events was when I told her I was going to ignore any sad signals from her and just be my happy funny self until she asked me otherwise. This worked because she got some distraction while knowing that I didn't "not care about what happend" but was purposfuly trying to not remind her.
So if you want you can tell certain people around you: "thanks for trying to give me emotional support but I got plenty of other people already doing that. Could you ignore my sadness and try to compensate a bit by being happy around …