> I don't know anything about depression, though I believe the up-and-down state you mention might be what they call manic-depressive. It seems to me that you need to get some proper help, though, if it's affecting your life this much. If you're a kid, maybe you should talk to your parents or a teacher you trust, or some other adult, about getting some proper counselling or advice.
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If that isn't a possiblity, I would try a priest or rabbi. These people are here to help others, even if you aren't religious. If they can't help you out, they'll be able to point you to someone who can.