That is an awful lot to go through and seeing someone actually die can be quite traumatizing ... For it to be a close family member or loved one, even moreso ... And on top of the trauma, there is also the grieving.
Medications are only going to be helpful up to a point though, so it really is important for you to find someone that specializes in trauma and/or grieving to talk to and help you process all the feelings and emotions whirling around inside you.
Be extra patient, gentle & kind with yourself during this process ... No matter how long it takes!