That can actually be a normal response to being low carb successfully for that long and resolving some of the insulin resistance that you had from being overweight. Something about adrenal hormone exhaustion. It doesn't tend to happen as noticeably if at all to people who don't have to lose weight but for people dropping lots of weight adding some more non fruit non grain carbs in can help stimulate the metabolism and aren't going to be as problematic because you are less insulin resistant.
Described by Matt Stone here. Yeah I know guys *ducks for cover* http://180degreehealth.blogspot.com/...honeymoon.html
Is everything else good? Omega 3:6 balance, general nutritional sufficiency, stress levels, exercise, vitamin d, not poisoning oneself? Have you tried IFing?
Stabbing conventional wisdom in its face.
Anyone who wants to talk nutrition should PM me!