Why do I feel like I need a coke when I'm depressed and useless and worthless?

I'm guessing it's related but I've been going through such a hard time and way too much to take. And now along with it I find myself feeling like I need a coke and like I would drink a lot of coke if I could. Like more than 2 2 liters.
Why do I feel like I need a coke when I'm depressed and useless and worthless?
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