What else can I do for energy?

Anonymous
I'm always tired and it's so depressing and frustrating to me. I don't know why. I take multivitamins. I take B12 liquid vitamins. I work out. I get enough sleep. My diet isn't bad. I'm not the most active because of school and work, but I work out 3 times a week. I've talked to a doctor but that wasn't much help. I ONLY get energy from energy drinks. Coffee doesn't help much. What else might work?
What else can I do for energy?
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