I don't kno you very well, but I do know how I would feel if I lost my best buddy: That would hurt like hell for a long time.
I feel for you, and I hope your family and friends are there for you.
You have my sympathy, and my thoughts and prayers are with you, and with your buddy's family and friends.
I've known Don for just under 20 short years, and he was like family. I didn't have a very large family when I started out in life, though we were a close-knit clan, and most have passed on now.