We've had similar experiences. I was having panic attacks and insomnia during the early 90's, and my doctor had prescribed anti-depressants before I had even finished telling him my symptoms. I was on them for quite a while, with this sinking feeling in the back of my head, that maybe he got it wrong, since he diagnosed me without testing me or anything
So I did what most in the medical profession call foolish: I stopped taking them. At the same time (and this is key) I started a diet and exercize regimen. Today, I am healthier than I have ever been (at 39, no less!) Also, I got religion, and turn to prayer whenever the "negative" thoughts start to creep in.
Of course, I guess I shoudn't be mad at my doc for zonking me out during the clinton years (hee, hee).