What Causes Sleeplessness While Having Bipolar Disorder And Anxiety?

I have bipolar disorder and am having a bipolar manic episode. I haven t slept since night before last. What really scares me is the thought of early dementia. I am not normally a severely forgetful person, but the events of the past couple of days has me concerned. Maybe if I tell you the events of the past couple of days, you might be able to give me some kind of direction. One of the things happening a lot is that I will be in a conversation with someone and I stop mid sentence, and ask the person I m talking with what I said. More often than not over these days, I can t even remember the last word I actually said. Even so, I couldn t remember what I was going to say, much less what I already said. I m constantly misplacing things because I don t remember where I last had whatever I was missing. I turned 59 last March and I thing what really worries is that my mental health is on the rocks. I also live with PTSD, and generalized anxiety, and have been hearing voices, yeah you heard right, since the age of 10. Any suggestions that will help be less anxious would be greatly appreciated. I don t want to convince myself that I m a candidate for dementia. I m not someone who when they read about certain, believe it s what s definitely happening to me.