Yes, there is such thing as "situational depression" also called Adjustment Disorder (DSM IV 309.x) but I don't think it's quite what you describe.
You wonder if being in an empty quiet house can make you feel down? Like a big emotional trigger? Hell yeah! Get out of there and go play.
I'm surprised you don't enjoy your time alone. Seems like it would be good time to write, run, and do SP-things.
"My actions are my only true belongings. I cannot escape the consequences of my actions. My actions are the ground upon which I stand." Thich Nhat Hanh
