I have finished "waking nightmare" up to the point right after you drink the potion. When I drink it transports me into the past but I am unable to walk or move at all and the conversation that is supposed to be taking place is absent. I've tried a few "setstage" commands with no luck. Any help at all would be much appreciated. I know this quest is a friggin bug fest. As far as I can tell this in an unsolved issue.

Load a previous save?

I have tried a few different saves. Doesn't seem to work though.