Huge handhold from me, OP. I was in a similar situation myself just over a year ago.
I had 2 weeks compassionate leave and 2 months sick leave. And tbh, I was glad to start work again, as it gave me something to keep me occupied. And I never got the floods of tears, I would find my eyes filling, and then it would stop, or I would cry for maybe 5 minutes and then stop. I still feel as though I could do with a massive sobbing fit that goes on and on, but it just doesn't happen.
All I can say is that it's still really early days. I lost my DP (also very suddenly, and also gorgeous and amazing) 14 months ago, and the bad times still come, but less frequently now. And I think it's affected my ability to remember stuff, like words for things, too. But it will get easier, I promise you.
Be kind to yourself, and talk about him as much as you can, share how you feel, and accept all the support that's offered. Bereavement counselling helped me to, you may be able to access that via your GP.
Take care. 