I'm a longtime RN with bipolar 1 who's had some major struggles with nursing jobs
over the course of my career, but would still encourage you to pursue nursing as long as you're being treated and can remain stable. You are no more of a risk to patients than anyone else if
your disease is properly managed; in fact, it can even be an advantage, as having a mental illness often makes people more compassionate, especially toward patients who are marginalized in some way. I know that after I was diagnosed, I became a lot more empathetic with the poor guy at my assisted-living facility who heard voices and threatened suicide every couple of days, and I fought hard for him long after his doctor, his case manager, and even his psychiatrist gave up on him.
That said: nursing is a stressful job even for "earth people", and it is doubly so for us. I ended up retiring from clinical nursing last year because I could no longer handle it either mentally or physically (I have a moderate amount of memory loss due in part to meds, repeated bipolar episodes and normal cognitive changes associated with aging). But what I learned from all that is that you have to take care of yourself. Take your meds on time, every time. Eat well and do some at least some physical activity on most days of the week. And do whatever you have to in order to protect your sleep!
There are a number of bipolar nurses here at AN who I hope will weigh in here, as well as a number of posts and articles on this topic in both the Nurses With Disabilities and Health and Stress Management forums. Welcome!