I lost my mum about 2 years ago, as many on here will have done too. Nothing I can say that will help but just know that you're not alone in your sadness. My condolences.
So sorry to hear about your Mom. My Mom was the same age and passed away last September.
to this day I still think about her every single day. Every time I had some good news or some bad news, I'd call my Mom.
Every time my phone rings late at night, I half expect to hear her say "Hello dear".