Medicine is one way to go, but read what Dr. Keith McCormick has to say about diet and your bones. Acid reflex could be your body having a hard time with the calcium your taking.
My scan was -3.1, in the spine and my Dr. wanted me to start meds, I'm a 65 year old woman. I power walk 2-3 miles, three times a week, I started jumping lightly 10 times a day landing on my heals (2x's a day;) started taking zen basil seeds, I eat mostly a veg/vegan diet, I don't smoke and occasionally have a drink. One year after doing the above I had another scan and my number dropped to -2.8, I am going to continue with my bone plan and add a gym membership for lifting weights with a trainer to get started on the right foot. I'm treating my bone density not as a disease, but as a product of getting older and working to slow it down as much as possible.
Before going on meds. read up about the med. your Dr. wants to put you on.