I am doing a little research. I have found a considerable amount of overlap in symptoms that are typically diagnosed as depression, anxiety and bi-polar disorder. I have looked into Epstein-Bar Virus, PTSD, Anemia, ADHD, Thyroid, and Sleep Apnea. It is amazing how much the symptoms overlap. I'd like to know if there are other conditions that cause or mimic symptoms of depression and/or anxiety. I would be interested in doing further research.