How do I deal with the death of my son?

In this episode, Dr. Betters answers the question, "I'm working through the Bible Study your wife wrote, Treasures of Encouragement. It is helping me with the loss of our 22 year old son, Cameron, who was hit head on and killed by a heavily drunk and drugged driver, who was 11 months to the day older than our Cameron. My husband and I have been married 24 years, and have 3 children. Cameron, 22 yrs old (lost him Sept 24, 2016), Peyton, 20 yrs old, and Dori, 12 yrs old. We are all struggling. Cameron was almost finished with his college degree and planned to be an Elementary Special Needs teacher. Cameron had so much respect for people, never judged them, always offered a helping hand, & loved Jesus. Since this ordeal, we have gone to church more & feel we can't get enough of learning about Jesus & God. I believe we took for granted the idea that Cameron would be here longer than my husband & I. Cameron also taught us more than we taught him. I don't think Cameron realized how many lives he touched. We didn't either, until approx 500 people showed up to say Good-bye to him. Cameron also participated in FCA (Fellow Christian Athlete) & eventually became a leader at their camps. Any words of wisdom? How do we show appreciation to God for giving us the honor to raise such a great son? The pain of not having Cameron's presence here is unbearable. It is difficult to function or feel that it's ok to ever be happy again. How does our family figure out what to do? We have always been an extremely close family. How do we help all the others that are struggling with the loss of Cameron too?"