First, the possibility is of heart related as you have swelling in legs, rapid heart rate and low BP. Secondly, as you have back and
leg pain that may originate due to slipped disc or disc prolapse conditions and symptoms may originate due to nerve root pressure, pressure on the spinal cord and pressure on the tail bone. Common symptoms could be paralysis of muscles, pain radiating to the arms or legs, leg pain and numbness, tingling, or weakness. .