@amyinnie,
you are on the best medication for your condition. Cheers to you PCP. It is so easy to get started on the wrong one.
You may already have a fracture and need an MRI to rule fracture out. And to discover the cause of your low back pain. Neither dexa nor x-ray are sufficient. You might ask the PCP for an MRI with and without contrast.
You'd want an endocrinologist to understand if you have a secondary cause for osteoporosis. Both you and @newenglandtransplant are a bit young to have osteoporosis. A secondary cause might indicate the need for additional treatment or a change in medication. Endocrinologists are the best informed test for secondary cause.
best wishes

Osteoporosis has been called the "silent" disease because you have it without symptoms until you fracture. To say osteoporosis isn't painful is a disconect between cause and effect that you can apply to any disease.