How to gain weight? Please help?

i have depression problems and stress problems aswell... i lose weight like water,

my current weight is like 107 or 106 lbs,.. i want to gain up till at least 114 lbs,...

people think i do drugs somtimes... when i used to be chubby i looked soo much better,. but now i just look sick and skinny...

no matter what i eat, i still dont gain weight...
How to gain weight? Please help?
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