It’s beautiful that you still talk about your Mum as you are. Everything you are going through is absolutely normal. When you grieve like you are it’s because the love you and your Mum had for each other was incredibly strong. That will be eternal too.
You will get through. Don’t rush it, let yourself feel all of the emotions fully. Time will get you through in the end.
I just lost both of my parents in the last two months and I am grieving the same as you.
Keep strong for your beautiful Mum.