MalPaz, prolactin is the hormone responsible for initiating breastfeeding. So unless you're pregnant and almost ready to give birth, it really isn't necessary! Plus with protein, if you're getting more than necessary your body can turn it into glucose to use as fuel through gluconeogenesis. If you are also getting enough dietary fat to use as fuel, your body then stores that glucose it just made as body fat. That was the short story (obviously).
Protein is important, but fat is more important for some of us. Besides, you came from a very different starting point from many of us, I've never in my adult life needed to gain weight to be healthy! You're doing a great job of healing yourself, but some of us have got to go in the other direction and lose body fat in order to be our healthiest. When things are working for a while (losing weight, getting more muscle tone, etc.) and then you start gaining weight again it can be very frustrating! Just as it would be for you if all the sudden you started losing weight while eating a ton of food. You'd have to reevaluate and try and figure out what to change in order to get back to gaining weight and getting your period back. That's all we're trying to figure out here, how to get back on track while staying healthy and not reverting to CW diet disasters like slashing calories or doing a "master cleanse."