I was hospitalized 20 years ago in my teens with depression. To my knowledge depression was all I was diagnosed with. I was put on lithium and responded wonderfully to it- totally got me back on a healthy track. I was also put on pamelor (VERY old school anti-depressant) at the same time.

It does seem strange for you to be diagnosed bc of what may (or may not) happen in the future, but if the lithium works then keep on taking it!