What Causes Groin Area Pain, Foot Numbness With History Of Blood Clot?

Caucasian male, age 56 5 6 at 178lbs with previous blood clot history believed complicated by, back surgery 5 years ago and presently deals with numbness in the left foot, and uses a cane to aide in walking which is limited over most men of his age in reasonable health. Problem: Pain in the left groin area. Patient describes it as dull and strangling sensation. Area is also sore to the touch. Patient does not have a fever or high blood pressure. Been taking iburprofin to manage the pain with limited success. Thank you for your time.