Annie - best of luck at the dr's. I just went too last week. I have my milogram (for the bulging disk i want to get 'fixed') on Tues. as well and have a BUNCH of blood work done too (that low hemoglobin).
Does anyone read "Biking Magazine"? They had a great aritcle on bone loss, etc. in there. From what i understand we should be all jumping up and down (!) to wake up those calcium/bone generating little guys down our spines. Because biking tends to be low impact (not talking to you brave wild women on the chunkie bikes) we tend to loose bone mass even faster becasue there is nothing to stimulate that regeneration. It was a fasinating article.
After reading aritcles like that you sum it all up and figure you can't win any way you look at it!!!! You run for impact...you wreck your knees and back, you bike and swim...you wreack your bone density. I guess we just need to be aware of EVERYTHING, treat our bods well and live life full. : )))