I too have a diagnosis for osteoporosis in my spine (-2.7). I consider my self fit but I have broken my fibula and 3 bones in my foot in the last 18 months! So I am taking the prescription for AA and everything else that I can throw at this 'silent' disease - calcium, Vitamin D and K2. I am eating a good diet and exercising through walking and using some weights. I have had no side effects from AA in the last 10 months but I notice that they come in different sizes so I always ask my pharmacist to supply the small ones- easier to swallow!
I know it all feels scary at first and there are a lot of unknowns. Keep reading all you can and talk to others as it will help you make your decision. Good luck!