[rtl49]

I recommend going to sleep if possible, or persevering with sleep in mind as something to look forward to. After waking, one tends to have a more harmonious frame of mind.

A sense of depression (and I assume you're referring to the emotion, not the medical condition) quite often has nothing to do with easily identified circumstances, the mind just tends toward the things it is dissatisfied with.

If you believe you have the medical condition, treat it like anything else: see a doctor. I know many people who have wasted years of their lives fearing a few moments of awkward discussion with their general practitioner. There's no rational reason to join them.