Thistle, gotta disagree on just one thing -- I'm 10 years older than you and I'm still "young" so YOU are definitely still truly young!

I'm glad you're doing research and taking action. You will be fine!

Oh Thistle! How awful and stressful for you and you family. You have rec'd a ton of good advice here already. I wanted to second the weight bearing resistance exercise. Also I (think?) I recall reading in a thread about our fashions histories that you struggled with an eating disorder. This can be a huge factor in bone density. From my undergrad exercise physiology work hearing about your bone density the Female Athlete Triad came immediately to mind. I can imagine it is still difficult (as many of my teammates struggled with eating disorders) but please be sure that your physicians have an accurate medical history on that subject so you can get as much of the best help going forward.
http://www.femaleathletetriad......the-triad/
and more hugs from me too

Hi Thistle - just wanted to chime in with good wishes... I hope you get some answers! I definitely believe in getting second and third opinions! Hugs!