The other thing is the Sensei you spoke of should have thrown you, even if you can't take a fall. Of course it would have to be on a big fluffy thick Hollywood stunt type of mat. Cause regardless if it was pre or post war Aikido and he threw you, and you don't know how to take a fall, you would be in an emergency room waiting for them to put you in plaster. don't think so even experienced Aikidoka get broke in practice from taking falls.
http://www.aikiweb.com/forums/showthread.php?t=15949