I have some sort of mood swings, according to my friend and my mother. I don't always notice it, though. Sensory and emotional overload usually pushes me on the depression / anxiety side, while some success in my life (including social achievements) or a pleasant event such as going to a bicycle tour can elevate my mood. Sometimes watching my favorite tv show (Star Trek DS9) or reading a very good book (for the Nth time) is enough, but there are periods in which I rather lean towards depression. However, there always seems to be a cause or causes behind it, at least in hindsight.
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Another non-English speaking - DX'd at age 38
"Aut viam inveniam aut faciam." (Hannibal) - Latin for "I'll either find a way or make one."