The way you think and your emotions is known, without a doubt, to cause problematic releases of serotonin, norepinephrine, etc. So it's possible that you developed anxiety first, and your chemical imbalances were the result.
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Including the condition of the 360, and believe it or not if it has the box it came with and even instruction manual. It also depends on the Gamestop. I'd say around $150 for an xbox 360. I went to Gamestop today (03/17/2011) and they will only give you $40 in cash for your Xbox 360 and $65 in store credit.