I would suggest you find another Canon camcorder as Redsox said, if the tape was recorded in LP then it will probably not playback in another make of camcorder, many years ago I was given a DV tape to record from and had exactly the same problems, I couldn't understand why it was playing at a fast speed, the answer was, it had been recorded in LP mode and not compatable with my camcorder.
The lesson is, Never ever use LP mode
I hope you can retrieve your footage, it sounds like the wedding was a WOW!