It is ok to be terrified. Many of the things you list are things I have been, or still am afraid of. But it's important to try and remember that the label won't change you. Receiving a diagnosis does not change you, it's just a word. Like someone telling you that you have red hair, whether that's true or not doesn't alter the colour of your hair. Someone telling you you have bipolar won't turn you into someone you're not (eg. a criminal).

Stigma is a difficult one. Self-stigma is the worst and one I'm still working on.

As for being "healthy", you're going for help because you're distressed and struggling. The purpose of the label is to help direct treatment to get you healthy. Some people do find that having a diagnosis and accepting it is helpful to understand what's going on and what they need to do to get well. Other people become overwhelmed by the stigma and get lost in the diagnosis and it ends up being unhelpful.

Meds, again one I struggle with. Not everyone with bipolar stays on meds their whole life, although many do. I hate taking medication, but my psychiatrist knows this about me so works to make sure I'm taking as little as possible. In particular I dislike Seroquel because I feel I become dependent on it for sleep. When I'm acutely unwell I end up on high doses, but once I'm stabilised she takes me off it gradually.

As for my hypomania - less sleep, energetic, irritable, lots of ideas in my head. I was up at 5am yesterday writing down all the thoughts in my head. I also tend to want to stop taking my meds, decide I've made the whole bipolar thing up and that there's nothing wrong with me. It does progress from there, but they're the first things I notice.