I'm in the same mood as you, fighting the sadness. Just got tears in my eyes thinking about how my D will probably never have a sibling. It kills me because I am so close to mine. H isn't, so he can't relate.
However, like you I will try to think of 2015 as the year the blinders came off, the year I realized I was alive and could feel things other than boredom and anger. And the year I made a lot of virtual friends.