Have you had an allergy panel done? With clean food you end up having more of single substances. Allergies could explain a lot. My daughter recently was feeling terrible all the time. She actually ended up in the ER from eating virtually anything. Her allergy results came back after a couple of weeks showing very high allergies to nearly all meat, plus as expected dairy and eggs.
Started Primal June 2012 at 148.5lbs, and 5' 1", reached goal weight in 5 months.
Lowest weight 93lbs - too thin. Now stable at 102lbs much better weight for me at my age.
Primal, minus eggs, dairy and a myriad of other allergens.