how do you deal with the death of a loved one?

one of my closest friends passed two days ago from brain cancer after only finding out about the cancer a month ago, her funeral was today but I couldn’t attend as she moved abroad earlier this year. I feel mentally drained and sick and have barely been able to eat for almost two days. I seem in this really depressed state at the moment and I don’t have enough energy to do anything, how can I get over this bc I hate how I feel and ik it’s just a part of life but it just hurts so so much 😭