Can it be stress? What should i do?

For the last month ive been eating and just sleeping, sitting watching t.v or laptop in bed or phone. i dont even go outside that often. ive been eating junkfood like fried everything donuts cookies whip cream cool whip icecream ect. and i keep losing weight!!!!! i did track b4 all of this and lost like 20lbs. but i continued 2 lose weight after. there has been alot of test but i dont think it was that. i have a boyfreind. i havent seen him in 2weeks. i miss him alot. we always talk on the fone but his cuz has been influencing him badliy.(drugs) hes 15 nd im13 if it matters. i have freinds my own age ive been hanging out with them. so im not lonley lol.