From what I know of antidepressants, they cannot cause you to spontaneously smell an odor. They can, however, dehydrate you, cause a metallic taste in your mouth, and increase sweating among other physical symptoms.

I would have to agree that your spontaneous episode of smelling that odor was most likely a memory triggered. Happens to me a lot and I don't have Bipolar Disorder.

For instance, I was walking down a stairwell of a building I'd never been to before and suddenly smelled cigar smoke. At first I was freaked out but then I remembered that my dad used to smoke cigars a lot in my childhood home, and he often smoked them while he walked around the house, even up and down the staircase in our house. For some reason, that day on the stairwell, it triggered that childhood memory of my dad and his cigar smoke and I have no idea why. After all, it was just a stairwell in a building I'd never been to before that had no association with my family or my dad.