I have good reason to believe that all bipolar people have had illusions - perceptions of things that are not real but really seem to be important and exciting.
The illusion that brought me down in my first manic episode was the 9/11 conspiracy theory. I felt a lot of stuff in response to things that I percieved to be real. I felt anxiety and fear when I considered the idea that our government could lie to us, and that the official story could be a lie. I'm not saying that there was any lying here, just that I percieved lies.
I dug into plenty of other related conspiracy topics with an insatiable thirst to get to the bottom of it all. I could not find a bottom, and I am certain that I would never be able to do it and stay sane. It was exciting but caused a lot of anxiety and fear that led to my first manic episode and hospitalization.
The illusion was that I percieved a need to know what I was being lied to about. What I failed to realize that the truth is I don't need to know everything, but that I needed to wake up so that illusions would not seem real anymore. Now, when I hear about 911 truth stuff, I am not emotionally upset in any way - took years to get to this by the way. Now, I realize that I have no reason to be distracted from my life's work, which is a source of joy.
Please feel free to post any "illusions" that you may have had, or currently have, that can bring you down and make you feel anxious or fearful.