Another thing that may trigger problems with eating and nausea is gastritis. Inflammation of the stomach - could be caused by medications (especially anti-inflammatories like aleve and ibuprofen), chronic stress, and cigarette smoking. I'm not lecturing about smoking. I am also a smoker.
But it's mainly important to take care of the vitamin deficiencies and get you feeling better and that way you will be on the right track to continue making positive changes.