If it helps any I had the same issues when I started lamictal. I had gone off my lithium 2 weeks prior and being off a mood stabilizer was not a good thing for me. My mood was up and down until about the 2nd month I was on lamictal. I'm now up to 100 mg am/pm.

I'm not a fan of the SSRI's (prozac is a SSRI), but without a mood stabilizer wellbutrin would trigger me in a mixed state or hypomania too.