@Butrflynet,
thanks, b-net. that is very instructional, also scary. i am now firmly convinced i have a hernia on my disk (had that in my wrist twice before), that i have fybromyalgia, inflamed muscles, pinched or injured sacral nerve (that one in particular)...
Voltaren helps, also sitting on the fitness ball seems to have been a good idea. much less pressure on my back. Sigh. I'm such a bad patient, I am used to being fit.