What are your DXA t-scores for spine, hip, femoral neck? That info helps a lot re: medication pathway.
Did you get tested for celiac disease? Fosamax will be less effective if celiac disease -- or another malabsorption condition -- is not under control.
I strongly recommend you purchase "Great Bones" by R. Keith McCormick. It has an extensive section on osteoporosis medications. You can get it on Amazon.
My primary care physician also recommended Fosamax (oral) or Reclast (intravenous), both anti-resorptive medications. After reading and doing my own research, I requested a referral to see an endocrinologist. Short story: I am taking Forteo, an anabolic medication.
Also, you do not need to make a decision immediately about next steps. Gather info first. Ask your doctor how long you can wait to make a decision. (Mine said 3-6 months after diagnosis.)