Hi Charlie,
As you can see from this other thread:-
http://neurotalk.psychcentral.com/thread163817.html
Lots of other people have had similar experiences. For me I definitely had a period of unusually vivid dreams the like of which I haven't had before or since. They weren't unpleasant, but I am certain the change in my dreams was linked to my PCS.
I think it was a stage in recovery and I hope your dreams will become less unpleasant soon.