You need to do your best to remain positive and remember these are just episodes - there will be light at the end of the tunnel.
I am assuming that now that you have been diagnosed, your pdoc will have put you on a mood stabliser as well as antidepressant? I also have anti-anxiety meds I can take as I need, and Hypnotic/sedative for night time
It will take a while to get the combo right, but eventually you should much more stable moods. When I'm depressed I think I tend to wallow. I listen to music, but when I'm down I tend to listen to the more calming music - Enya, Katherine Jenkins... which just keeps me in my hole. Maybe try listening to music you normally feel is uplifting. I know it can be hard and it's the last thing you want to do, but maybe give it a try.

I also just want to sleep when I'm feeling depressed.
Do you have a close friend or work colleague you can talk to? It has helped me immensly at work having someone right there, who I can drop a one-liner to, explaining my mood, and I get a motivational reply. when I feel I've had enough, we go to the canteen for a change of scenery. Or even a walk, when I can cry and let it all out. If I really cannot cope and need to go home, she can speak to my line-manager on my behalf, saving me from having to do it.
And on weekends, I have a friend in a totally different town who also has BP, who I know I can phone or sms at any stage when I need some motivation.
Surround yourself with a strong support system while you don't have the strength personally, then get into therapy to help you find it in yourself to cope.

Hang in there (HUG!)