The pain and hardness in your ankle after the attempted IV injection are most likely due to a local soft tissue injury, inflammation, or a small collection of blood (hematoma) rather than a bone problem. Since the pain increases with movement and has not improved with medication, you should avoid further injections in that area and focus on simple care: rest the ankle, limit walking, keep the leg slightly elevated, and apply cold compresses (ice wrapped in cloth) for 10-15 minutes, 3-4 times a day for the first 2-3 days. If stiffness persists later, you can switch to warm compresses. If you notice increasing pain, redness, warmth, swelling, fever, or difficulty walking, or if there is no improvement within 3-5 days, consult a doctor promptly for examination and possibly an ultrasound to rule out complications such as infection or deeper tissue injury.