hi.M Arifa.age 23yrs (F), 5.1', 44kg, sedentary worker, my prob is.iam under wt, feeling very weak, lazy, no interest in wotk,nd other activities, BMI cums below 25.i gain wt. 3-4kg in last 3mnts by having gud high cal,high protien fat diet wit protien supplements, bt suddenly i stop gaining my wt. and it goes reduced. wht to du? plz suggest me.