I do find that my environment/outside stimuli does effect my mood, but I'm not able to sustain the feeling over a longer period and I return back to being depressed. This left me confused for a very long time because I got the, totally false, impression that I could just snap myself out of depression, if I only found the right combination of things. Other times I'm so lethargic that even a good book (etc.) has no impact on my state of mind at all. It's been really frustrating and left me feeling despondent at times. So anyway, I don't think you are alone in your experiences. Like you say, it is difficult to explain exactly.

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