Im able to find some happiness in a few things. None are enough to get me out of the deep depression, but they help ease the pain a bit.
My dog, it's hard to not get happiness from a dog being excited to see you and doing silly things like when she is outside and finds a stick she really likes and is all proud of it.
Music, sometimes when the right song comes on at the right moment I feel a brief flood of happy chemicals. For example I was driving and I heard Kids by MGMT on the radio. I hadn't heard that song in a long time and it brought me back to a time when I was happier and less weighed down by life. Moments like that, for just a few minutes, can few good.
Good food/drinks. Getting a warm coffee drink and sipping it on a cold day, a dinner from a family-owned restaurant, or late night ice cream, these can give me temporary happiness.
Nature helps, even if it's just to disconnect from everything for a bit. Sometimes I can get really lost in nature and temporarily forget my pain, and feel a bit of warmth from the world I rarely feel.
But most of all is genuine, human connection. I can't really apply this to my life because I completely lack it and can't seem to find it, and I'm not sure if I ever will again. But I've had a few moments here and there that made me feel truly alive. I wish I could bottle up that feeling and save it because it's truly better than any drug and has made me feel the closest I've ever felt to being happy I exist. Unfortunately all these connections were reduced to brief moments in the past as a result of various circumstances, mostly a result of my inability to maintain them. But I believe genuine human connection gives me those happy chemicals more so than anything else.