I believe they have terrified you and your understand how this happens. Please know that stress hurts bone as it produces cortisol.
I only had one Reclast infusion and it made me very sick. I have had nothing sense. I lift weights and walk and live my life. I read books about this and I took a three month course. Low bone density does not mean low bone quality. You do need to learn how to move your body. Go on Facebook and search for Brick House Bones with Dr. Lisa. She has a PHD in physical therapy and specializes in osteoporosis and osteopenia. Don't say all that you wrote above. Just watch and watch and watch until you see what's going on and you will likely begin to feel more at ease.
Do it for one week at least and then contact me again. We can exchange personal info and be in touch. There is a way. I do not trust doctors. They make a lot of money off of these drugs and if sick people. I do not trust the FDA. Blessings to you. Please smile and take a deep breath. You got this.