how far discirmation goes

really on how far discrimination goes other than just race, sex,religion for people trying to get disability etc ,people overweight are being judged based of there apperance not the medical evedince,i have p.o.t.s which is a lifelong tachychardia syndrome,petitmal seizueres which is life long and ive had since i was 5,social anxiety disorders,learning disabilities,hearing loss,and a chronic depression disorder which is life long that i was diognoed with when i was 11 and im denied disability,but peope who did drugs and still do have no problem getting disability,people who look like there in great health get it,see discrimination isnt just in schools and the workforce its in the goverment and hospital, people overweight dont have problems to begin with ask how they got there,to begin with