Struggling with a New Diagnosis of Bipolar 1

I was just getting used to the idea of my diagnosis and now it has changed. I feel silly because it didn't change all that much. It went from Bipolar 2 to Bipolar 1. That's hardly anything but it kind if feels like my world changed. I don't understand it. If I was getting used to having an official diagnosis shouldn't everything still be fine? Maybe it's that this new diagnosis will also come with a medicine change. I was happy with not noticing side effects of my current meds. I'm so afraid of the trail and error that comes next.