I think mood fluctuation by itself is 100% normal with all people, not just those with bipolar. But, I think we're more sensitive to it. I think if your meds are keeping you from having extreme lows and highs that's the goal. But your moods will still fluctuate.

Have you worked on coping techniques? Like breathing exercises, reality checking, and mindfulness? I think once you've been through a major episode it's normal to have some fear about going through it again.