I can understand your concern. I was first treated for major depression and the anti-d's pushed me into a mixed episode within 3 weeks of being on them. I ended up in a Psychiatric hospital where I was diagnosed. I was devastated at first, but now that I look back on it receiving the diagnosis/being treated has saved my life.

If you don't already I would suggest tracking your mood. I use this online one: http://www.medhelp.org/land/mood-tracker