I can go from calm and relaxed to totally stressed out and panicky in a matter of seconds, when confronted with a sudden change, but then, even if the matter is resolved it will leave me jittery and cranky the rest of the day, and much more likely to succumb to depression. But happy to unhappy and back again, no, that never happens to me, but then actual happiness is pretty elusive on the whole.
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"I don't mean to sound bitter, cynical or cruel - but I am, so that's how it comes out." - Bill Hicks