I lied to all my friends and my ex without knowing it

I don't know what happened. They are telling me I did things and lied about things I can't even recall saying, and now they all think i'm horrible, and tell other people im horrible. I've started to go along with the truth that they believe by apologizing for it, yet when they ask me for details i get mixed up because I don't know what happened, which makes them think im lying even more. There's no way they'll believe me if I say I don't remember. Some of the things sort of sound familiar but then some things are completely confusing me and I'm loosing everyone I care about. Does anyone have any tips on how I can get through this? The things they are saying must have happened but why don't I remember them? I'm so scared and I want it to go away. I'm sorry for ranting.