26 Weeks Pregnant and Feeling Depressed?

I am a stay at home mom of a 15 month old baby girl with #2 on the way. My fiance works from 8am to sundown, and then when he gets home alot of the time he goes out, so we never get to see him. I'm not as attentive with my daughter as I feel I should be. I've been slacking on housework because I don't have the energy or desire to get my off the couch. I feel like a very selfish person right now because all I can think about is what I'M missing in my life and letting everything fall apart around me. I can tell it's affecting my daughter because she's been very moody lately. I just don't know how to get out of this rut that I'm in. Does anyone else feel like this? Is this normal? I didn't feel like this with my first, but I know every pregnancy is different. I don't want to be put on medication if I can avoid it, but I don't think I would even want to go out to see a counselor. Any suggestions?