I was going to answer this question, but I just couldn't get excited enough.

I have definitely had problems with emotional flatness. And it's not always the mood stabilizers at fault. I'd been taking Cymbalta as my antidepressant and it made me tired and flat. I dropped it and started on Pamelor (a tricyclic) and am having more emotions now. Yay!

But, no question that my overall meds combo keeps me away from the destructive swings, and I recognize that it has to cost me some emotional sensitivity. For me it's a matter of striking a balance I can accept.