Oh Becky, I'm so sorry. There is no one like your mum and it is a huge blow to lose your mum at any age, but must have been very hard to lose her in such a sad and upsetting way and so unexpectedly. Sending you a welcome hug.
The doctor gave you good advice. It does help to talk and this is a good place to do some of that, as everyone here will have lost someone and will know only too well what you are going through. I found my way here after I lost my own mum in 2017 and can tell you that, despite the awfulness of it all, it does slowly get better. It is a very hard thing to go through, the hardest thing I have ever done and it takes a long time for it to get any better. I found the first couple of years very hard, but you just have to find little things that help, any little thing. For me it helped to walk in the park and have flowers around at home. The park was a calming place to sit and think and try to come to terms with all that had happened and flowers lifted my spirits a little and reminded me that, although I felt my world had collapsed, there are still good things in it. It also helped me to keep a diary and write down each day how I was feeling and what I was thinking and to write a one-off account of what had happened and how I had felt about it all very honestly. That somehow helped me feel that, although I couldn't change anything, I had, to some extent, got if off my chest a bit. If you find little things to turn to when you are feeling low, that will help a little and help you find your way through this terrible time. If it helps to talk to us here, please feel free to say whatever you feel. No one will judge and we will all understand. We are here for as long as you need us. You are not alone. Bless you.