Ah Mel, thanks so much! Funny thing is, I've actually been doing a number of those things, just 'cause they felt good. Yesterday at dinner time I was lying on the floor flat on my back with my knees in the air, rocking them from one side to the other. Nice, eh? Poor DH was trying to get food on the table after working all day, 'cause I was a wreck. And I got him to rub that very spot on my butt, 'cause it felt like it would help, even though it was sore.
Anyways, hopefully this will help me deal with the bad days. And you have my sympathy as well - it's not a fun time.