Still younger than Stinger
I didn't have to do anything like that as I was still in Vegas the morning my sister called. My mom found dad and he'd been dead for a while. She had been up for a while but never thought of looking in his office. She has always beaten herself up over what she could have done. Dad had the home phone and his cell phone on him but he didn't call anyone. Chances are he was dead before he hit the floor. My issues are that I avoided talking to my dad the last few days of his life. There wasn't any reason just me being stupid. What I wouldn't give for five more minutes.
Time helps but it will never erase everything. Losing your best friend is something you'll never really get over. And having to go through what you did doesn't make it any easier. Depend on friends and use your memories every day. My dad passed in April 2009 and every football season it gets tough. Actually anytime OU sports comes up. Use your friends. don't be afraid to express your feelings.