Good luck today. I was you eight years ago, a month off after losing my Mum. I don't have advice as it was a blur and I handled it badly I think, drank far too much at the end of every work day for starters. I think the best advice I can give is if you're like me and likely to do that, try to distract yourself in the evenings with telly or a bath or a book, the wine really doesn't help.
May not be an issue for you, so other advice would be nature, lots of it, and as somebody said upthread, small things that make you feel good. Nice dressing gown, hand cream, anything. I stopped self care and I think it could have been good.
I do have one tip that is something I actually got right, I talked about her every day, still do. I was determined she would still be here, still be Granny to my girls who were 5 and 3 at the time. I've pulled that off, she feels real and part of our everyday life.
Talk to colleagues, don't feel embarrassed. In work, you won't be normal, and you won't ever be the same. That's okay. Don't try to be.
Think about counselling, I had hospice counselling which was good, although some time later.
Make memory boxes, find photos etc. Jewellery of hers or that reminds you of her is a good tip.
Oh and another thing which has worked, ancestry. I had a yearning to get closer to who she was, so started digging. Is now my hobby, I understand her family through the ages, and I've felt so much closer to her through it.
A new hobby or interest or project that is somehow related, even something as simple as a nice notebook for writing down your memories, or her sayings, or to process your feelings about what's just happened, can be good outside work as it can get you through the day thinking I'll be able to think about Mum tonight.
Don't try and be normal, or try and get over it basically. You can keep her with you to help you through I think.
Possibly terrible advice, I was a total mess so you probably don't want to take advice from me.
Take care of yourself.