I honestly wish I knew how to navigate this feeling of grieve. I lost my dad in July 2024. It was really quick and I found the 1st anniversary so so hard. My mum fell ill in August this year and passed away 25th September- I am returning to work on Monday and I am so anxious about getting upset when people ask how I am. I know its coming from a good place but I just don’t want to cry all the time.
I’m so sorry for your losses. 
Is there anyone at work you’re closer to? Maybe you could talk to that person before Monday and ask him/her to tell the others that they shouldn’t ask how you are the first thing they do? They will understand, I’m sure.