Trucker - I am sorry you are feeling so down - I pray that you mood will lift soon and that you don't have to take meds. If the depression lasts or comes more frequently, imo seeing a doctor couldn't hurt. To my knowledge anti-depressants are non adictive.
I like the idea of a lightbox. I think I may get one for my daughter, she gets depressed in the winter and as soon as the days start getting longer she pops out of it.