If the mind is grieving, let it grieve, but also challenge yourself with positive things. Allow yourself take steps to feel better. This is not a selfish act, but a form of self care that is necessary for your mental health.
Allow yourself to smile if you want to smile. Allow yourself to laugh if you find something funny. Surround yourself with friends and family to be comforted.
It may be easier to push people away during this period, but easy never makes things better quickly. Allow the comfort and the support. It's good for the soul and can really help with moving forward.
There will be really, really hard days where you won't want to get out of bed. There will be really easy days where everything seems to go smoothly. This is normal. It's all part of the process.
Traumatic events will never leave your thoughts, but they won't consume your life if you cope with them straight away. I will always be sad about what happened to my nephew, but I also know he would not want me to live a life of sadness.
Remind yourself that you are worth it daily. Fight though the hard times and live a life you and all of your loved ones would be proud of.
You got this.