Hi,
I talk to myself too. I have this little voice in my head and we have discussions, it's almost like there's two of me, and I've done it in front of people and they look at me with a confused expression, like what on earth or who on earth are you talking to!
I am forgetful, sometimes total memory loss.
I would agree with above, taking note of anything traumatic that's happened too if it has and talk to your doctor