Newly diagnosed

I've recently been diagnosed with Osteopenia and I was in shock. I have small bones and or was 5' 1 1/2" so I therefore take a large amount of calcium/magnesium 2000mg. to be as preventive as possible. I am on the treadmill everyother day and eat well. No caffeine, very little sugar, and I can do better with the veggies yet this diagnosis threw me. I'm only 51 and otherwise quite healthy, I recently stopped my birth control pills to see how menopausal I am. I have regular periods although short and light, I can become warm at night but no sweats. I tell you this so you know where I am on the menopausal scale.

I cannot believe in this day and age that nothing can be done. My hips are the factor right now and I asked whether medications like Boniva can help and I was told no not yet. Well then when?  I'm big into preventive so I am getting a second opinion for my own sanity.