I have injured my ankle before (sprain/torn ligament) and a couple months ago. an x-ray was done and no break seen. now i'm having sharp pains again.?

Ankle: See orthopedic surgeon & get MRI to check for talus ostechondral defect/fracture, bone contusions, or syndesmotic tear.

See Specialist: Have it evaluated to determine what is going on and to get proper treatment. May need MRI to further assess: especially for soft tissue damage.

Could be soft tissue: Soft tissue injuries can heal and sometimes create scarring/adhesions which can compress surrounding tissue, including the nerves. This may be the case. Be sure to be checked properly.

Have it evaluated.: Swelling may last a long time following a foot or ankle injury. An x-ray can show if there is an underlying fracture. The x-rays may be falsely negative initially in cases of small stress fractures. You may have a soft tissue injury if it is just a sprain and may have damaged the muscle, tendon, or ligaments in the area. Have it evaluated by a professional and get the appropriate treatment.