The tragic loss of a loved one, such as what happens when a car crash is the reason for the death, can bring up a lot of feelings. You have to address these and work through them so that you can learn to live life again. This isn't going to be easy at all.
Since you didn't have time to prepare for the loss, there is a good chance that you will feel shocked and in disbelief at first. This might make it impossible to feel the grief that is going to come. Once you start to realize that this is a reality, you might start to feel anger. This isn't an anger that most people are used to feeling. It is a deep anger that demands some sort of action.
Eventually, you will start to question what happened. You might want to know about your loved one's final moments and exactly what led to the fatal crash. This information might help you find some sort of closure after the crash.
At some point after the loss, you will feel the weight of knowing that your loved one isn't going to come back. This can create a rollercoaster of feelings that will come and go often and without notice. Coping with this is difficult, but most people can find ways to make it through these.
Because you might want to avenge your loved one's death, you should look into a wrongful death lawsuit. There are limited cases in which this action can be taken, so you need to find out if your case qualifies.