Just a dream?

I tend to be a little absent-minded sometimes. It’s difficult to remember names, faces, dates, etc that some people get mad with me because of it (though those who really know me know that I have short term memory)…However, apart from the fact that I’m a bit exaggerated with this, I have to say that there are things that happened to me but I can’t remember them.
According to my mum, when I was seven years old I almost die from pneumonia because of my baby-sitter’s lack of attention. Apparently, my nanny was not very good with me and she never looked after me. She warned me not to say anything and she made me believe that if I did it, I would be severally punished. My mum says that when I was very ill, I was talking nonsense because of the high fever and it was when I told her all the things that the nanny did to me. After that, my older sisters said the same. The thing is that I can’t remember those moments. Perhaps it’s because I was afraid but it worries me cause there’s another moment in my life (that it wasn’t one of the best) in which I have had dreams about it, or let’s just say that they are nightmares, things that would change my view towards life if they never happened. My memories and my dreams are mixed and I don’t know what the reality is. I don’t have anybody who can help me as at that moment I was alone. It’s awful to know that you don’t know but the worst of this situation is that I’m not really sure if I do wanna know what happened cause I’m not sure I’m ready to face it.