How can i lose weight fast? diet tips ? help depression ?

over the last 8months iv gained 10lbs. i feel terrible, i cry almost everyday, i feel fat and disgusting and can barley look at myself, unwanted, unloved. i used to be so sli and confidented. my weight has ruined my life! i go swimming twice a week and go gym very often, i try to controll my eating but cant resist sweet things. have a really sweet tooth. how can i stop myself from feeling so down ? how can i stop cravings ?