Eating disorder

So I’ve had bulimia for a while but I haven’t been able to admit it for ages and I finally have been able to admit it but like I was looking up like side affects sort of things and it said stuff about messing with periods and it’s full messing with mine like, it will end then come back a week later and then end again and come back four days later then end then not come back for agessss and I’m sort of starting to worry cause like I know eating disorders are really bad and stuff but I just feel like I’m really fat and then I get sad and I binge eat cause I get sad and then I get sad again and purge and I don’t really know what to do about it. Like I’m already dieting and exercising so much and I’ve lost 5kg in the past month but I just feel like no mater what I do I’m never gonna be comfortable with my body. Does anyone have any advice on building self confidence?