I assume you mean eating disorder and not erectile dysfunction. You can have withdrawal symptoms any time you make changes from your routine and try to break an addiction. You just have to be patient and work through it.
if your erectile dysfunction is an addiction I'd seek urgent medical advice. especially because it seems to be giving you the idea that attempting to kick a nun won't get you arrested..
Of course, it's an addiction and a disease. It's not like you can quit it and expect you will be over it right away. It takes time to get back into the habit of eating right and eating the right amount of food. I would highly suggest, though, for the person who is doing this to have a doctor supporting them because this would be way too hard to do by yourself in my opinion.