I received Reclast infusion - no side effects for 6 days, other than a headache. On the 7th day after, I woke up, my neck was so stiff, could not turn it either way. My entire left side was affected. It was like I had be shot full of arthritis, my fingers were to stiff to bend. I fell terrible, the pain is intense. Today is 11 days after injection, I feel some better, still can't move my neck, but can bend fingers with a lot of pain. My Dr. says this in normal. The headaches have been awful.