It sounds like you have had some significant health challenges in the past. It is a very positive step that you are able to take these proactive steps for yourself and work to deal with bulimia and the side effects this disease can have on the rest of your health. Swelling in the lymph nodes and salivary glands in the face/neck area is definitely one of the side effects of continual binging and purging associated with bulimia. How and when this kind of swelling resolves depends on the individual patient and how longstanding her eating disorder
was, which is why you should continue to discuss the case with your physician. It is possible that gland hypertrophy in an individual patient may not completely resolve, but this is a very individual issue and would need to be assessed by the physicians treating formerly bulimic patients. In many patients, when the cycle of binging and purging stops, the tissues which are damaged during this process--including the salivary glands--can slowly go back to normal. This sounds like what you were taught in treatment centers. However, it is always possible that the damage to a particular salivary gland is significant enough that it may take a long time to resolve. Hopefully this is not the case for you, and if you have concerns about this you should continue to discuss them with your primary care physician
and any other medical professionals involved in your treatment center.