First off, you have to understand that depression is fairly normal. Normal or not, though, if you let it, depression will take over your life and if you have an actual chemical imbalance then its very hard not to fall deeper and deeper into depression. Just being depressed doesn't make you a candidate for medication, but the inability to bring yourself out of the fugue state of mind (or the apparent inability to give a crap. I'm new, can I say crap?) might. As one prone to depression, i can tell you what helps me are the questions. The why, how, when, what, where of anything and everything helps me stay out of areas of thought that would be counter-productive. Basically, if I don't have time to think about it, then USUALLY I don't get depressed. That is provided that nothing happens in my everyday life to kickstart the depression.
I love the fact that no matter how much I learn, I find new things to ask questions about. With every answer comes more questions. I equate it to exploring a new area (physically). That is also how I treat it, I learn enough to be able to tell someone the best restaurants, convience stores, where the closest Wal-Mart and grocery stores are, and so on. However, I don't know all of the backroads, or the physical address for everyone living there, or even where the police stations are. I am a long term visitor, but not a resident. Basically, I am an inquiring mind, not an expert in any given field. That being said, I might know more about Bremerton, WA (or residential construction, gene therapy, particle physics, or general physics) than a resident of Groton, CT would (a polymer scientist). One day I hope to find something that fits in terms of a specialty (or a place I'd like to live), but today is not that day, and tomorrow isn't looking good either. Until then, I'll keep learning new things and figuring out more questions to ask and wondering how it all could connect from mass manufactoring to nano polymers. Or how to drive from Philadelphia, PA to Gulfport, MS without getting stuck in traffic. Again.