I am also in recover from anorexia
and bulimia nervosa
. This happened to me while I was in recovery also. Basically, if you suffered a loss of periods due to lack of body fat, then that 'clump' or whatever is the result of your body trying to do what it was made to. They should get normal after about 6mo or so. The same side-effect can happen after masturbating, especially close to one's cycle.