[Coffee.]

Are you currently seeing a psychologist about the eating disorder? This needs to be something discussed. Purging does a lot to your body, and it really can be negatively affecting how the medicine reacts in your body. You may also be throwing up the medicine by purging after taking it, depending on how fast it hits your blood stream, and in that case it may be pointless taking it.

Also remember, even if a warning sign is weight gain, it doesn't always happen! My birth control caused no weight gain for me, even if it's a symptom. So keep that in mind before worrying. Take care!