I was using Tymlos while still working but got terrible heart palpations so dr. switched me to Forteo which was great. Too expensive once I retired so switched to Prolia shots which were great. Moved out of state and specialist suggested I could have an infusion just once a year. My bad for not asking for more information. Had I asked the name, I'd have learned it was bisphosphonates which I NEVER wanted in my system. Too late. I had the infusion 3 weeks ago and had horrible flu symptoms for the next 3 or 4 days - thankfully no nausea. However since then I have had awful pounding headaches and neck pain since then. I'm living on Tylenol, sleeping a lot, and limited energy. Going for a contrast MRI next week and really don't expect any answers. Next year I'll go back to Prolia.