Re: Can you make yourself have symtoms?
I think what you're referring to are psychosomatic symptoms/disorders. Basically, if your physical ailments seem to have to other reasonable physiological cause, and stem from emotions like anxiety, anger, guilt, etc (all of which are very common w/ both anxiety and depression), these physical ailments are often classified as psychosomatic. It is just the brain's chemistry and resulting emotions causing actual, physical ailments. I doubt a brain tumor would fall under this category though.
During my first major episode of depression/anxiety, many years ago, I swore up and down that I was sick with something... all signs pointed towards mono. Upon much testing and many doctors appointments, it was determined that I was sick, but with "a mono-like syndrome". In other words, it wasn't mono physiologically, even though I displayed almost all the symptoms. When they put it all together that I was also suffering from anxiety and depression, they explained that my mind caused all these physical symptoms.