Asking for ways to cope and Other people’s experience

So last week I(22M) lost my girlfriend (F22) to a car accident in my arms. The way that happened was, we were going grocery shopping together but we decided to meet the store as we both have different ways of commute. I rode an electric bicycle and she rode her bike. When I got near to the supermarket, I saw people gathering around near a car. As I got closer I saw my girlfriend stuck under the car. For obvious reasons I would not describe how she was in details. As soon as I saw that I threw my bike away came running to her and held her hand. She saw me and she blinked twice and she passed out. I was panicking and I dun know what to do. Soon after the paramedics arrived and we took her to the hospital. 5 mins later the doctor came out and said that she was gone before the paramedics came. I saw her like 5 mins before and after that she was gone. This week has been really hard for me to handle. I had to plan for her funeral and everything. I’m barely surviving. I’m finding ways to cope and there seem to be non for me. So please if other people have ways or perspectives to see this and cope, I’m willing to listen.