It really sounds like you have a really boring or non full-filling life, and apathy more or less has taken over.
I mean unless you can prove to yourself you didn't actually do what you remember, then it's really not a dissociative problem. I mean technically, you can be disassociated from your physical actions, but you'll more or less know that something actually happened. If you don't then don't get anxious about it, as there is no point crying over spilt milk, so to speak.
If it helps at one point in time people had convinced me that in my youth I had been beaten and absued and I searched my memories really thoroughly until I though maybe it could have actually happened. Then I realized it never did, so that was very "dreamlike" to me. I accredit it to good visual processing and an active imagination. More along the lines of creativity, rather than a problem. I was never really anxious about anyways, as what happened in the distant past is largely irrelevant to how I challenge myself these days.
Maybe you just need to go outside?
Here, this is pretty good too...
http://www.youtube.com/watch?v=WsUaQUW-Az0