I am not sure who you saw, but I think they should take you more seriously, it's not all about looks and as you said can deteriorate fast. I had that exact problem when I developed an eating disorder, that I declined quick. Three months is a long time. I know it's hard when we aren't mentally well, but if you think you need more help I hope you will continue to seek help for the ED, and not let someone tell you you are okay if you know that it is becoming more severe. I hope the caseworker is helpful.