Sudden weight loss is usually associates with some type of intestinal disorder and/or obstructed bile flow (fats can't be absorbed so fat soluble vitamins).
So you did not mention you cleaned up your liver/gallbladder, if you really didn't- just continue untill u r done.
Other thing what you have to look is at one of the two, besides liver, the most underrated organs in the body- adrenals. These two guys, sitting on top of our kidneys do enormous amount of job, much much more that to produce epinephrine (adrenalin) and cortisol. You might have either Addison's disease or severe adrenal fatigue (somewhere in between of addison's and normal adrenal function). Fascinating cascade of events are related to adrenals. Just get the book of James L. Wilson "Adrenal fatigue" and read it.
By the way, there is adrenal fatigue support forum- look in there.
And besides that look continually what's bothering you- maybe it's copper in the water, maybe it's mercury in your teeth fillings, maybe it's asbestos- who knows? Just continue looking and fighting!