Hi Sara Elizabeth,
Having anorexia nervosa
is a serious condition. You need to be eating frequently and I hope you are seeing a counselor for therapy sessions. If there is no access or difficulty obtaining one, I suggest that you do some self-help books on anorexia. Eating frequent meals and hydrating yourself would be one aspect, while not working out too much and stressing yourself would be another. Increasing the dose of fuoxetine might help, however it would be wise in that case to consult a doctor.
Take care of yourself and have a good day.