the other thing I hate to tell you is...if your head was thrashed about...nerves in your vestibular area can be damaged if not severed...and until they regrow...extremely slowly if at all....your head may always be playing catchup (mentally) to outside physical stimulus on its movements. (and it SUCKS).

another thing to try is set up your trainer facing a mirror. find something for you to sit upright, hold onto something nearby and watch your head in the mirror as you attempt to completely cease any head movements as you spin. then after a couple of minutes...release your hand steadying your upper body and allow your self via the mirror reflection to have your head move with your cadence rhythm. (just another test to prove possible vestibular nerve damage)(of which I hope you do not have...trust me...i know)