I have a diagnosis of bipolar II which I'm pretty solidly in agreement with. Part of what led to that diagnosis was going on prozac and (after a while) having it kindle an ultrarapid high-amplitude mood cycle of truly epic proportions. Once we put two and two together and stopped the prozac, the cycling immediately reverted to its previous level which is typical of bipolar II (mostly depressed with little normal or hypomanic mood).

I am quite emotionally sensitive, not just to my own emotional life but to picking up moods from my environment. I can have a brief induced hypomania just from a single really good conversation, and it will start happening during the conversation and then I need to be careful what I say or how I act. On some occasions this can extend into hypomania that lasts more than a few hours. I note lately that this effect is very powerful, I think because my life has been a mess for so long and my isolation so great that even mild doses of positive human interaction are a really big deal.

tl;dr: yes, it's possible for this to happen and probably not even that out of the ordinary.