I thought I was depressed and anxious for almost two years. It turned out I just had a chronic sinus infection. I'm suspicious that a lot of what gets considered as psychiatric problems are really physical health problems. Anecdotally, a lot of people switch to a nutrient dense diet and cut out potential allergens and wind up feeling all better.
Not just anecdotally -- plenty of studies confirm this. Some people -- 30% of the people by some estimates -- simply suffer from fructose malabsorption. This means that when they eat foods with excess fructose (even fruit), they fail to properly absorb nutrients. In particular, individuals who suffer from fructose malabsorption fail to absorb tryptophan: http://en.wikipedia.org/wiki/Fructose_malabsorption Tryptophan…
My dad last year suffered from a mix of dizziness, nausea, depression and if he got too nervous, muscular contractions.
Went to a bunch of doctors, each one gave a different pill, and his situation wasn't improving. I had to research the internet looking for symptoms and possible causes.
Then, in the end, talking with a generalist doctor, it ended up being a thyroid disfunction (he was taking pills for that) and magnesium deficiency. After a year taking kelated magnesium and cutting the thyroid medicine (the doctor told to), he's 100% again.