You might consider looking into testing your reaction some of these other tested histamine rich foods: alcohol and long-ripened or fermented (and therefore histamine-rich) food, such as aged cheese, cured meat, and yeast products; histamine-rich food, such as bananas, spinach or tomatoes; or histamine liberators, such as citrus fruit, should be avoided.
I know several of those are a no brainer, but a few (spinach, tomatoes) were a surprise to me. I've been researching foods that cause histamine reactions to limit the enormous restrictions I had recently set on my diet. Like you, I'm trying to open my diet as not to trigger past disordered eating behaviors. I would prefer to know the exact foods that cause negative physical responses, as opposed to cutting entire food groups out of my diet. Hell, I have gone weeks where I ate only apples and almonds out of fear that I would breakout. I can't afford to slip down that slippery disordered eating slope anymore. Being aware of the exact foods that are the problem has freed up my dietary allowances, and my mind!
Thank you for being open about the issue of your eating disorder. It opens this topic up to show there needs to be a boundary on the lengths we will go to clear our skin. No one should needlessly go down the path of disordered eating as the means to end the problem of acne; having suffered through both, we know the path of an eating disorder creates far more anguish and destruction. It is a delicate balance.