Hmmm - when you enter the turning room, there ought to be an exit open to the left - I think that should take you to the big fat "Y" room. The door to the left is the only other door that should be open on the rotating room at this point.
Did you use a glowstone near the door to the turning room? You really want to have 2 glowstone when you get to the Y room - you can take a glowstone out of its lock when you are done with a particular area as well.
Hope that helps somehow - I don't have a map of this area - will check to see if Xignal did a map (he's got great hints). If I find it, I'll repost you the URL so you can take a look!
Wyv
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