Dear madam. Please see a orthopaedic surgeon or nearest a and e .. asap. In the meantime avoid putting any weight on the ankle and elevate on pillow. Don't not hang foot. Try to keep it elevated as much as possible. You have not written how old is injury which is very important. After any injury and in severe pain and accompanying crackling sounds, a fracture is very likely. The expected line of management of ankle fracture is x ray and proceed with plaster plus or minus surgery.