I have bulimia and have had major problems with my periods. Once again I have lost my period all together and I was told it was because of the bulimia and the stress it puts on my body. I would suggest going to see the doctor but they will probably tell you to seek help for you eating disorder and if you are not in a place to do that right now then I'm not sure what else to advice. Possibly start taking vitamins if you don't already?