Get with a doctor who has experience dealing with autoimmune issues. Anecdotally, I can say your issues are consistent with Celiac disease. Headaches/migraines

Get with a doctor who has experience dealing with autoimmune issues. Anecdotally, I can say your issues are consistent with Celiac disease. Headaches/migraines, depression and "brain fog" are some of the most common symptoms. Your B12 and D deficiencies are also suggestive of malabsorption of nutrients in your digestive tract. It isn't necessarily Celiac (I have a bias here since I was diagnosed with Celiac/gluten intolerance in 2009 with symptoms quite similar to yours), but I would get some tests from a doctor who can look at and rule out GI parasites, thyroid issues, Celiac, Crohn's/colitis (especially if you have GI issues like gas/bloating as well.) Also, if you have been in an area with ticks, get checked for Lyme disease--the symptoms you describe are also indicative of Lyme, and the "bullseye" spot on your skin from the tick bite doesn't happen to all Lyme patients. Good luck!