Sophie, both Forteo and Tymlos slow progression. They have the advantage of increasing bone mass more powerfully than the bisphosphonates. Current thinking is to take the bone building drugs first because bisphosphonates (Fosamax) blunt the effect of the anabolic drugs (Forteo, Tymlos). There is some buzz about combination therapy.
You might contact your physicians' offices and ask them to consider anabolic drugs. I would specify Forteo (windyshores might say Tymlos).
If you don't have your bone marker results, you might ask for them.
Our bones break down so that they can be rebuilt to protect against fracture according to our current activity. The new spicula (the slender bones called trabecular bone) in the center of the bone realigns itself (anisotrophy) so as to provide the greatest strength for the angle of impact. If you are jumping out of airplanes, or skipping rope it prepares the bone for that particular angle. The bisphosphonate stop that process by preserving old bone.
It may be that Fosamax is the best drug for you right now. You might want to see an endocrinologist who specializes in osteoporosis. But be assured that those powerful drugs are waiting for you whenever you need them.