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Ruminate: to think deeply and obsessively over something.

Thanks man.. i will keep it in mind.

Answering to the message below: I've been vegetarian for more than 2 years, do u think it has something to do?

No worries. I was depressed for many years myself. I know the downward spiral. Sleeping enough (not too much) and eating lots of protein, veggies, and fruits helps a lot too.