Wow, 12? Well firstly take deep breaths and try to relax. Was there something preventing you from doing them or was laziness involved? I had three essays due tomorrow and I didn't do any of them because it was my break lmao. You could explain it to them, like try to be slick about it. You left it at home, a family problem or event, my internet went out, I wasn't home and left all my materials but if you could give me one day I'll have it finished tomorrow, etc.
Depression suck and you need to try to not let it get the best of you. I go through my moments, yes but if you allow something to happen, chances are you didn't do anything to help prevent it or give you a different outcome.