I want to gain weight!

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when I used to have a boyfriend, I felt I gained weight, whatever he eats, I eat, and he loves eating like any kind, so as me. But when he's gone, I lost my appetite,my doctor said it's normal coz I'm suffering from depression. Now after 2 months, I feel I've recovered, I need to get back on my feet again. But how? I seldom eat breakfast, I usually eat at 10 am, then eat in the afternoon at 2 or 3 in fast food restos, then I'd get home and eat again well not all the time though. When my bf is still around, I would eat breakfast, then eat at 10am, then sometimes at 2,then eat again when I get home at 7. any specific food or vitamins I should take to gain weight? thanks very much for the help.