Looking at your medical hx and meds again, I noticed your are epileptic. I have a friend who is also and always had issues with not being able to gain weight when on his seizure meds. I'm not sure about yours or even his because I'm not sure which one he takes but maybe a possibility its your seizure med that could be a possibility as well? Just a thought.
DX:SLE, Sjogrens, Raynauds, Migraines, Occipital Neuralgia, Morphea (Localized Scleroderma), Iron Deficiency Anemia, IBS, Diverticulosis
Meds:Prednisone, Plaquenil, Sulindac, Tramadol, Topamax, Xanax, Imitrex, Fiorinal, Prenatal Multi, B12, Vit E, Calcium, Fish Oil, Biotin, Ferrous Gluconate, Baby Aspirin